Repository: rust
Issue: `item_bodies_checking` CPU time and `liveness_and_intrinsic_checking` mem usage explode on a generated ~2.5MB .rs file
Labels: I-compiletime,T-compiler,I-compilemem,C-bug

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I've been working on a [compiler project](https://crates.io/crates/kaze) to be able to describe digital logic in rust. This logic can be compiled to Verilog for use on FPGA or in silicon, and in order to test, it can be compiled to a simulator as pure rust code. The idea is that a user would use a `build.rs` script to compile the relevant module(s) and output to a `modules.rs` file, and then the hw module(s) can be tested/verified with regular rust code/tests.

The [main project](https://github.com/xenowing/xenowing) I'm building with this is getting to the point where the simulator exposes some scaling issues. In particular, when compiling the generated rust code, rustc's memory usage stays around 100-150MB for most of the process, but then suddenly jumps to 11GB+(!!!) towards the end, before either completing (mac) or causing my system to come to a grinding halt (windows) and requiring a hw reset (due to the exorbitant memory usage causing constant swapping). Additionally, the compilation process takes well over a minute for this single file.

I've packed one such `modules.rs` into [a project](https://www.dropbox.com/s/7bvxsdlpn35nqri/a.zip?dl=0). It's enough to `cargo build [--release]` to reproduce the issue. The file contains a single simulator `struct`. Its `new` fn is relatively normal, as is its `posedge_clk` fn. Its `prop` fn is very large - this is where the majority of the logic lives to propagate signals through the design. So I would imagine there's something that scales superlinearly that tends to work fine under more typical circumstances, but for a large fn with loads of bindings, it blows up.

I did a bit of preliminary [profiling](https://rustc-dev-guide.rust-lang.org/profiling.html) out of curiosity. Running `cargo rustc --release -- -Z self-profile` yields this:

<details><summary>(summary output for `a`)</summary>
<p>

```
$ summarize summarize a-42631.mm_profdata 
+-------------------------------------------------+-----------+-----------------+----------+------------+
| Item                                            | Self time | % of total time | Time     | Item count |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| typeck                                          | 63.82s    | 78.922          | 63.85s   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_liveness                              | 14.71s    | 18.197          | 14.71s   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_borrowck                                    | 497.69ms  | 0.615           | 912.49ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| run_linker                                      | 390.20ms  | 0.483           | 390.20ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_built                                       | 374.79ms  | 0.463           | 377.57ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| expand_crate                                    | 194.45ms  | 0.240           | 213.22ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_match                                     | 138.03ms  | 0.171           | 138.04ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| resolve_crate                                   | 118.20ms  | 0.146           | 118.20ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_lowering                                    | 70.37ms   | 0.087           | 70.37ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| free_global_ctxt                                | 68.06ms   | 0.084           | 68.06ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lint_mod                                        | 41.90ms   | 0.052           | 41.90ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| build_hir_map                                   | 41.35ms   | 0.051           | 41.35ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| region_scope_tree                               | 40.12ms   | 0.050           | 40.12ms  | 7          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_privacy                               | 34.40ms   | 0.043           | 34.48ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| drop_ast                                        | 33.45ms   | 0.041           | 33.45ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| early_lint_checks                               | 20.03ms   | 0.025           | 20.03ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_passes                                     | 18.37ms   | 0.023           | 18.56ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_codegen_emit_obj                    | 17.20ms   | 0.021           | 17.20ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_promoted                                    | 16.02ms   | 0.020           | 413.11ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| analysis                                        | 15.55ms   | 0.019           | 79.84s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| pre_AST_expansion_lint_checks                   | 12.58ms   | 0.016           | 12.58ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_lto_optimize                               | 12.10ms   | 0.015           | 12.10ms  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_const                                       | 11.29ms   | 0.014           | 397.01ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_item_children             | 10.04ms   | 0.012           | 10.04ms  | 4649       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| unsafety_check_result                           | 6.92ms    | 0.009           | 385.23ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_optimize_module_passes              | 5.96ms    | 0.007           | 5.96ms   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| evaluate_obligation                             | 5.84ms    | 0.007           | 14.75ms  | 127        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_adt_def                   | 5.80ms    | 0.007           | 9.64ms   | 972        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_lints                                     | 5.72ms    | 0.007           | 5.80ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| predicates_of                                   | 5.65ms    | 0.007           | 10.25ms  | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_item_attrs                | 5.23ms    | 0.006           | 5.23ms   | 997        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_intrinsics                            | 4.88ms    | 0.006           | 4.88ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_register_crate                         | 4.68ms    | 0.006           | 6.82ms   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_trait_ref            | 4.39ms    | 0.005           | 14.07ms  | 1572       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_attrs                                 | 4.12ms    | 0.005           | 4.47ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| complete_gated_feature_checking                 | 3.83ms    | 0.005           | 3.83ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lint_levels                                     | 3.55ms    | 0.004           | 3.55ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_private_in_public                         | 3.33ms    | 0.004           | 3.36ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| resolve_lifetimes                               | 3.19ms    | 0.004           | 3.22ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| collect_mod_item_types                          | 2.76ms    | 0.003           | 10.23ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| AST_validation                                  | 2.62ms    | 0.003           | 2.62ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_optimize                            | 2.59ms    | 0.003           | 10.29ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_module_optimize                         | 2.50ms    | 0.003           | 16.40ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| death_checking                                  | 2.34ms    | 0.003           | 5.92ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_loops                                 | 2.04ms    | 0.003           | 2.04ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| privacy_access_levels                           | 1.97ms    | 0.002           | 1.98ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| self_profile_alloc_query_strings                | 1.90ms    | 0.002           | 1.90ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_module                                  | 1.85ms    | 0.002           | 4.95ms   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| wf_checking                                     | 1.79ms    | 0.002           | 43.75ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_children                                   | 1.77ms    | 0.002           | 11.81ms  | 4649       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_optimize_function_passes            | 1.74ms    | 0.002           | 1.74ms   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_codegen                             | 1.72ms    | 0.002           | 18.92ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| param_env                                       | 1.68ms    | 0.002           | 3.51ms   | 299        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_const_bodies                          | 1.55ms    | 0.002           | 1.56ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| get_lib_features                                | 1.55ms    | 0.002           | 1.55ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_load_macro                             | 1.54ms    | 0.002           | 1.54ms   | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| stability_index                                 | 1.54ms    | 0.002           | 1.54ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_unstable_api_usage                    | 1.46ms    | 0.002           | 3.12ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| visible_parent_map                              | 1.38ms    | 0.002           | 13.23ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| predicates_defined_on                           | 1.32ms    | 0.002           | 4.21ms   | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| trait_impls_of                                  | 1.31ms    | 0.002           | 2.06ms   | 26         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_def_span                  | 1.25ms    | 0.002           | 1.25ms   | 324        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_generics_of               | 1.06ms    | 0.001           | 1.06ms   | 1571       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| generics_of                                     | 1.05ms    | 0.001           | 5.36ms   | 2928       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| parse_crate                                     | 1.05ms    | 0.001           | 1.05ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| setup_global_ctxt                               | 1.01ms    | 0.001           | 1.01ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_optimized_mir             | 998.43µs  | 0.001           | 1.01ms   | 28         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_associated_item_def_ids   | 993.72µs  | 0.001           | 993.72µs | 73         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_crate                                   | 993.27µs  | 0.001           | 33.87ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_item_well_formed                          | 949.86µs  | 0.001           | 1.52ms   | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_module_perform_lto                      | 915.64µs  | 0.001           | 28.69ms  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| vtable_methods                                  | 905.31µs  | 0.001           | 3.85ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_op_prove_predicate                         | 894.86µs  | 0.001           | 1.32ms   | 30         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| specializes                                     | 834.32µs  | 0.001           | 2.93ms   | 444        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| drop_compiler                                   | 767.77µs  | 0.001           | 767.77µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| eval_to_allocation_raw                          | 742.39µs  | 0.001           | 15.36ms  | 24         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| explicit_predicates_of                          | 729.46µs  | 0.001           | 1.37ms   | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_def                                         | 728.89µs  | 0.001           | 10.52ms  | 973        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| resolve_instance                                | 629.76µs  | 0.001           | 2.43ms   | 25         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_binary                                     | 626.47µs  | 0.001           | 391.38ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| layout_raw                                      | 594.55µs  | 0.001           | 2.79ms   | 73         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_fn_sig                    | 587.68µs  | 0.001           | 648.99µs | 38         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| inferred_outlives_crate                         | 575.19µs  | 0.001           | 1.10ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_implementations_of_trait  | 571.50µs  | 0.001           | 571.50µs | 390        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_fn_attrs                                | 551.70µs  | 0.001           | 2.47ms   | 35         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_trait_ref                                  | 533.98µs  | 0.001           | 14.61ms  | 1573       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link                                            | 529.91µs  | 0.001           | 391.95ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_binary_remove_temps                        | 491.66µs  | 0.001           | 491.66µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_explicit_predicates_of    | 481.45µs  | 0.001           | 481.45µs | 382        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| def_kind                                        | 478.00µs  | 0.001           | 618.36µs | 1763       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_type_of                   | 467.71µs  | 0.001           | 664.90µs | 112        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| monomorphization_collector_graph_walk           | 442.63µs  | 0.001           | 24.44ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| prepare_outputs                                 | 436.36µs  | 0.001           | 436.36µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_of                                         | 421.55µs  | 0.001           | 1.76ms   | 1466       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| associated_items                                | 403.52µs  | 0.000           | 1.80ms   | 73         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| def_span                                        | 360.74µs  | 0.000           | 1.61ms   | 1681       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_copy_raw                                     | 357.05µs  | 0.000           | 2.48ms   | 18         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| symbol_name                                     | 355.19µs  | 0.000           | 406.19µs | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_fulfill_obligation                      | 349.28µs  | 0.000           | 605.93µs | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_op_ascribe_user_type                       | 340.78µs  | 0.000           | 340.78µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| inferred_outlives_of                            | 297.45µs  | 0.000           | 1.52ms   | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| normalize_projection_ty                         | 293.07µs  | 0.000           | 458.63µs | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_import                            | 292.17µs  | 0.000           | 292.17µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| optimized_mir                                   | 283.55µs  | 0.000           | 2.31ms   | 29         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_sized_raw                                    | 282.34µs  | 0.000           | 343.65µs | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_attrs                                      | 278.66µs  | 0.000           | 5.51ms   | 997        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lookup_deprecation_entry                        | 256.29µs  | 0.000           | 1.82ms   | 1364       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| associated_item                                 | 236.81µs  | 0.000           | 442.39µs | 524        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_trait_of_item             | 218.15µs  | 0.000           | 218.15µs | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_shims                                       | 216.51µs  | 0.000           | 344.81µs | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_diagnostic_items          | 213.79µs  | 0.000           | 213.79µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| visibility                                      | 208.13µs  | 0.000           | 215.94µs | 1377       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| specialization_graph_of                         | 205.87µs  | 0.000           | 1.93ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_associated_item           | 196.88µs  | 0.000           | 196.88µs | 520        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_impl_item_well_formed                     | 178.56µs  | 0.000           | 40.43ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_global_analysis                   | 167.55µs  | 0.000           | 167.55µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_item_types                            | 166.71µs  | 0.000           | 2.03ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| implementations_of_trait                        | 165.27µs  | 0.000           | 736.77µs | 390        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lit_to_const                                    | 163.01µs  | 0.000           | 172.09µs | 127        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| method_autoderef_steps                          | 155.76µs  | 0.000           | 428.60µs | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| normalize_generic_arg_after_erasing_regions     | 146.80µs  | 0.000           | 15.85ms  | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| promoted_mir                                    | 145.57µs  | 0.000           | 145.57µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| erase_regions_ty                                | 144.51µs  | 0.000           | 191.99µs | 47         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_parent               | 143.28µs  | 0.000           | 143.28µs | 99         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_dtorck_constraint                           | 141.87µs  | 0.000           | 429.38µs | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_def_kind                  | 140.36µs  | 0.000           | 140.36µs | 405        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_exported_symbols          | 133.94µs  | 0.000           | 133.94µs | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_drops_elaborated_and_const_checked          | 133.15µs  | 0.000           | 136.50µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_inferred_outlives_of      | 128.91µs  | 0.000           | 128.91µs | 382        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_polarity             | 125.56µs  | 0.000           | 125.56µs | 283        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| configure_and_expand                            | 123.92µs  | 0.000           | 338.09ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_super_predicates_of       | 121.02µs  | 0.000           | 121.02µs | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| eval_to_const_value_raw                         | 115.21µs  | 0.000           | 30.90ms  | 44         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_polarity                                   | 109.87µs  | 0.000           | 235.43µs | 284        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| issue33140_self_ty                              | 104.63µs  | 0.000           | 133.99µs | 242        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_freeze_raw                                   | 99.04µs   | 0.000           | 1.57ms   | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dropck_outlives                                 | 97.43µs   | 0.000           | 371.14µs | 11         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| get_lang_items                                  | 96.91µs   | 0.000           | 144.43µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| write_allocator_module                          | 91.47µs   | 0.000           | 91.47µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| associated_item_def_ids                         | 90.36µs   | 0.000           | 1.08ms   | 74         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| fn_sig                                          | 89.77µs   | 0.000           | 738.76µs | 43         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_reachable_non_generics    | 88.93µs   | 0.000           | 178.30µs | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_place_roots                    | 80.40µs   | 0.000           | 112.14µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dependency_formats                              | 74.24µs   | 0.000           | 141.68µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| liveness_and_intrinsic_checking                 | 70.33µs   | 0.000           | 14.72s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_check_crate                                | 69.05µs   | 0.000           | 63.91s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| implied_outlives_bounds                         | 64.75µs   | 0.000           | 64.75µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_binary_check_files_are_writeable           | 60.27µs   | 0.000           | 60.27µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| needs_drop_raw                                  | 58.75µs   | 0.000           | 2.08ms   | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| MIR_borrow_checking                             | 57.32µs   | 0.000           | 912.55ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_lookup_stability          | 55.38µs   | 0.000           | 55.38µs  | 18         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| subst_and_check_impossible_predicates           | 55.31µs   | 0.000           | 165.82µs | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| monomorphization_collector_root_collections     | 51.69µs   | 0.000           | 511.23µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| create_global_ctxt                              | 50.98µs   | 0.000           | 1.06ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_keys                                        | 48.09µs   | 0.000           | 48.09µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| exported_symbols                                | 47.06µs   | 0.000           | 181.00µs | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_injection                                 | 44.05µs   | 0.000           | 44.05µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_sized_constraint                            | 43.58µs   | 0.000           | 117.16µs | 12         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| reachable_non_generics                          | 40.93µs   | 0.000           | 241.16µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_trait_def                 | 39.09µs   | 0.000           | 39.09µs  | 19         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| misc_checking_1                                 | 37.93µs   | 0.000           | 11.35ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_const_qualif                                | 37.68µs   | 0.000           | 37.68µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| misc_checking_3                                 | 36.00µs   | 0.000           | 95.07ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_naked_functions                       | 34.97µs   | 0.000           | 34.97µs  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_reachable_non_generic                        | 34.73µs   | 0.000           | 275.88µs | 14         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_abstract_const                              | 34.56µs   | 0.000           | 34.56µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_parent                                     | 33.56µs   | 0.000           | 176.84µs | 99         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| static_mutability                               | 32.02µs   | 0.000           | 36.62µs  | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_destructor                                  | 31.72µs   | 0.000           | 1.85ms   | 9          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| trait_of_item                                   | 31.36µs   | 0.000           | 249.51µs | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| trait_def                                       | 31.08µs   | 0.000           | 70.17µs  | 19         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_adt_destructor            | 30.33µs   | 0.000           | 65.03µs  | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_mir_available                                | 29.89µs   | 0.000           | 97.88µs  | 28         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| unused_lib_feature_checking                     | 29.86µs   | 0.000           | 1.58ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| inherent_impls                                  | 29.68µs   | 0.000           | 41.62µs  | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| collect_and_partition_mono_items                | 29.57µs   | 0.000           | 25.57ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_rename                            | 28.83µs   | 0.000           | 28.83µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| supported_target_features                       | 28.30µs   | 0.000           | 28.30µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| variances_of                                    | 27.23µs   | 0.000           | 58.13µs  | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_merge_cgus                     | 27.09µs   | 0.000           | 27.09µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_lookup_deprecation_entry  | 26.82µs   | 0.000           | 26.82µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_expn_that_defined         | 25.80µs   | 0.000           | 25.80µs  | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| expn_that_defined                               | 25.75µs   | 0.000           | 51.55µs  | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_drop_tys                                    | 25.59µs   | 0.000           | 123.70µs | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_profiler_runtime                             | 25.29µs   | 0.000           | 26.14µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_late_bound_map                               | 24.27µs   | 0.000           | 24.27µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_impl_wf                               | 23.88µs   | 0.000           | 23.88µs  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| assert_symbols_are_distinct                     | 23.74µs   | 0.000           | 394.67µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| object_lifetime_defaults_map                    | 22.61µs   | 0.000           | 3.24ms   | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_collecting                                 | 22.39µs   | 0.000           | 10.25ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_missing_extern_crate_item | 21.13µs   | 0.000           | 21.13µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_foreign_item                                 | 20.39µs   | 0.000           | 27.75µs  | 13         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| typeck_item_bodies                              | 20.26µs   | 0.000           | 63.85s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_mir_available          | 19.90µs   | 0.000           | 19.90µs  | 27         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| looking_for_entry_point                         | 19.56µs   | 0.000           | 33.35µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| index_hir                                       | 19.39µs   | 0.000           | 41.37ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| coherent_trait                                  | 18.99µs   | 0.000           | 1.76ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_variances                                 | 18.72µs   | 0.000           | 18.72µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lookup_stability                                | 18.70µs   | 0.000           | 74.08µs  | 19         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| join_worker_thread                              | 17.64µs   | 0.000           | 17.64µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| match_checking                                  | 17.54µs   | 0.000           | 138.05ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| missing_extern_crate_item                       | 17.53µs   | 0.000           | 38.65µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| reachable_set                                   | 17.16µs   | 0.000           | 17.16µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_generate_lto_work                       | 16.97µs   | 0.000           | 187.31µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_internalize                       | 16.49µs   | 0.000           | 16.49µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning                                | 16.42µs   | 0.000           | 182.65µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| coherence_checking                              | 16.21µs   | 0.000           | 50.58µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_panic_runtime                                | 14.97µs   | 0.000           | 17.08µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| super_predicates_of                             | 14.83µs   | 0.000           | 135.86µs | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| defined_lang_items                              | 14.58µs   | 0.000           | 24.70µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| MIR_effect_checking                             | 14.33µs   | 0.000           | 14.33µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_owner                                       | 14.14µs   | 0.000           | 41.38ms  | 11         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| looking_for_derive_registrar                    | 14.01µs   | 0.000           | 22.04µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| entry_fn                                        | 13.79µs   | 0.000           | 13.79µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_place_inline_items             | 13.35µs   | 0.000           | 13.35µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_inherent_impls                            | 13.27µs   | 0.000           | 13.27µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| native_libraries                                | 13.18µs   | 0.000           | 20.85µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_owner_nodes                                 | 13.08µs   | 0.000           | 13.08µs  | 7          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| looking_for_plugin_registrar                    | 12.89µs   | 0.000           | 19.60µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_used_crate_source         | 12.64µs   | 0.000           | 12.64µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_name                                      | 12.46µs   | 0.000           | 13.56µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_variances_of              | 12.18µs   | 0.000           | 12.18µs  | 7          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_inherent_impls            | 11.94µs   | 0.000           | 11.94µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| normalize_opaque_types                          | 11.62µs   | 0.000           | 11.62µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_resolve_weak                      | 11.11µs   | 0.000           | 11.11µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| parent_module_from_def_id                       | 10.66µs   | 0.000           | 10.66µs  | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| panic_strategy                                  | 10.59µs   | 0.000           | 11.47µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| upvars_mentioned                                | 10.22µs   | 0.000           | 10.22µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_unit                                    | 10.19µs   | 0.000           | 10.19µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_defined_lang_items        | 10.12µs   | 0.000           | 10.12µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_inherent_impls_overlap_check              | 9.82µs    | 0.000           | 13.51µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| used_crate_source                               | 9.66µs    | 0.000           | 22.30µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| assert_dep_graph                                | 9.39µs    | 0.000           | 9.39µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| macro_expand_crate                              | 9.24µs    | 0.000           | 213.22ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_module_items                                | 9.13µs    | 0.000           | 9.13µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| all_crate_nums                                  | 8.87µs    | 0.000           | 8.87µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| finish_ongoing_codegen                          | 8.79µs    | 0.000           | 26.43µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| original_crate_name                             | 8.66µs    | 0.000           | 8.87µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| extern_crate                                    | 8.39µs    | 0.000           | 8.92µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dep_kind                                        | 8.32µs    | 0.000           | 11.04µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_crate                                       | 8.30µs    | 0.000           | 8.30µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| proc_macro_decls_static                         | 8.03µs    | 0.000           | 8.03µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_internalize_symbols            | 8.01µs    | 0.000           | 8.01µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| recursion_limit                                 | 7.96µs    | 0.000           | 7.96µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_visibility                | 7.81µs    | 0.000           | 7.81µs   | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_native_libraries          | 7.68µs    | 0.000           | 7.68µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| module_exports                                  | 7.57µs    | 0.000           | 7.57µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| missing_lang_items                              | 7.52µs    | 0.000           | 13.95µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_foreign_item           | 7.36µs    | 0.000           | 7.36µs   | 13         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| module_lints                                    | 6.83µs    | 0.000           | 41.90ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_const_fn_raw                                 | 6.82µs    | 0.000           | 6.82µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| backend_optimization_level                      | 6.78µs    | 0.000           | 6.78µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_wf_inference                               | 6.75µs    | 0.000           | 30.63µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| maybe_create_a_macro_crate                      | 6.74µs    | 0.000           | 6.74µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| privacy_checking_modules                        | 6.73µs    | 0.000           | 34.49ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| plugin_registrar_fn                             | 6.71µs    | 0.000           | 6.71µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| symbol_mangling_version                         | 6.66µs    | 0.000           | 7.37µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| opt_const_param_of                              | 6.66µs    | 0.000           | 6.66µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_missing_lang_items        | 6.43µs    | 0.000           | 6.43µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_defaultness                                | 6.30µs    | 0.000           | 8.48µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| features_query                                  | 6.29µs    | 0.000           | 6.29µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_codegened_item                               | 6.10µs    | 0.000           | 6.10µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| named_region_map                                | 5.73µs    | 0.000           | 5.73µs   | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| partition_and_assert_distinct_symbols           | 5.73µs    | 0.000           | 583.05µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| serialize_work_products                         | 5.69µs    | 0.000           | 5.69µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| instance_def_size_estimate                      | 5.65µs    | 0.000           | 5.65µs   | 13         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_disambiguator                             | 5.41µs    | 0.000           | 5.65µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_args                                       | 5.19µs    | 0.000           | 5.19µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_compiler_builtins                            | 5.12µs    | 0.000           | 5.89µs   | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_types_checking                             | 5.12µs    | 0.000           | 2.03ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| orphan_checking                                 | 5.00µs    | 0.000           | 5.00µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| in_scope_traits_map                             | 4.96µs    | 0.000           | 4.96µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| diagnostic_items                                | 4.84µs    | 0.000           | 218.63µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_static_mutability         | 4.60µs    | 0.000           | 4.60µs   | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| extern_mod_stmt_cnum                            | 4.52µs    | 0.000           | 4.52µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| all_local_trait_impls                           | 4.50µs    | 0.000           | 4.50µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| postorder_cnums                                 | 4.44µs    | 0.000           | 4.44µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| misc_checking_2                                 | 4.38µs    | 0.000           | 14.86s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lint_checking                                   | 4.23µs    | 0.000           | 47.71ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_no_builtins                                  | 4.06µs    | 0.000           | 4.84µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_crate                                      | 3.82µs    | 0.000           | 391.39ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| output_filenames                                | 3.80µs    | 0.000           | 3.80µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_bodies_checking                            | 3.78µs    | 0.000           | 63.85s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| maybe_building_test_harness                     | 3.49µs    | 0.000           | 3.49µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| param_env_reveal_all_normalized                 | 3.35µs    | 0.000           | 3.35µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| <unknown>                                       | 3.26µs    | 0.000           | 3.26µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| attributes_injection                            | 2.86µs    | 0.000           | 2.86µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_lto_generate_symbols_below_threshold       | 2.79µs    | 0.000           | 2.79µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_dep_kind                  | 2.72µs    | 0.000           | 2.72µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| unsafety_checking                               | 2.59µs    | 0.000           | 2.59µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| monomorphization_collector                      | 2.53µs    | 0.000           | 24.95ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| used_trait_imports                              | 2.38µs    | 0.000           | 2.38µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| maybe_unused_extern_crates                      | 2.25µs    | 0.000           | 2.25µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_defaultness          | 2.19µs    | 0.000           | 2.19µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_panic_runtime          | 2.11µs    | 0.000           | 2.11µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| find_cgu_reuse                                  | 1.90µs    | 0.000           | 1.90µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| plugin_loading                                  | 1.77µs    | 0.000           | 1.77µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| serialize_dep_graph                             | 1.77µs    | 0.000           | 1.77µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dep_graph_tcx_init                              | 1.71µs    | 0.000           | 1.71µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| has_typeck_results                              | 1.25µs    | 0.000           | 1.25µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_crate_name                | 1.10µs    | 0.000           | 1.10µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| layout_testing                                  | 918.00ns  | 0.000           | 918.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_patch_debuginfo                   | 889.00ns  | 0.000           | 889.00ns | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_panic_strategy            | 888.00ns  | 0.000           | 888.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_profiler_runtime       | 850.00ns  | 0.000           | 850.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_no_builtins            | 781.00ns  | 0.000           | 781.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_compiler_builtins      | 767.00ns  | 0.000           | 767.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_symbol_mangling_version   | 706.00ns  | 0.000           | 706.00ns | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_extern_crate              | 534.00ns  | 0.000           | 534.00ns | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| write_crate_metadata                            | 526.00ns  | 0.000           | 526.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| drop_dep_graph                                  | 375.00ns  | 0.000           | 375.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_unused_macros                             | 301.00ns  | 0.000           | 301.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_crate_disambiguator       | 241.00ns  | 0.000           | 241.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_original_crate_name       | 216.00ns  | 0.000           | 216.00ns | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| llvm_dump_timing_file                           | 211.00ns  | 0.000           | 211.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| plugin_registration                             | 83.00ns   | 0.000           | 83.00ns  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
Total cpu time: 80.86475014s
```

</p>
</details>

Unfortunately there doesn't seem to be any memory usage info in this report (at least not that I know how to extract), but most of the time is spent in `typeck`, which may be relevant, but I'm not at all familiar with rustc's internals.

For the sake of trying _something_ I did hack my compiler to output types for all the temporaries in the `prop` fn (that version is available [here](https://www.dropbox.com/s/0zmmi4qdugo2r3l/b.zip?dl=0)). While this does make things about 10 seconds faster, the mem usage spike is still there, so it's not really a viable workaround.

<details><summary>(summary output for `b`)</summary>
<p>

```
$ summarize summarize ./b-43023.mm_profdata 
+-------------------------------------------------+-----------+-----------------+----------+------------+
| Item                                            | Self time | % of total time | Time     | Item count |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| typeck                                          | 50.03s    | 72.754          | 50.06s   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_liveness                              | 15.97s    | 23.228          | 15.97s   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_borrowck                                    | 565.67ms  | 0.823           | 1.03s    | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_built                                       | 421.41ms  | 0.613           | 424.60ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| run_linker                                      | 373.43ms  | 0.543           | 373.43ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| expand_crate                                    | 328.05ms  | 0.477           | 373.18ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_match                                     | 158.69ms  | 0.231           | 158.70ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| resolve_crate                                   | 158.33ms  | 0.230           | 158.33ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| free_global_ctxt                                | 89.45ms   | 0.130           | 89.45ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_lowering                                    | 86.25ms   | 0.125           | 86.25ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lint_mod                                        | 57.96ms   | 0.084           | 57.96ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_privacy                               | 51.09ms   | 0.074           | 51.18ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| build_hir_map                                   | 45.86ms   | 0.067           | 45.86ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| drop_ast                                        | 41.69ms   | 0.061           | 41.69ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| region_scope_tree                               | 40.94ms   | 0.060           | 40.94ms  | 7          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| pre_AST_expansion_lint_checks                   | 33.93ms   | 0.049           | 33.93ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| early_lint_checks                               | 21.40ms   | 0.031           | 21.40ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| analysis                                        | 19.30ms   | 0.028           | 67.50s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_passes                                     | 19.03ms   | 0.028           | 19.23ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_codegen_emit_obj                    | 15.55ms   | 0.023           | 15.55ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| AST_validation                                  | 13.64ms   | 0.020           | 13.64ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_promoted                                    | 12.62ms   | 0.018           | 457.95ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_const                                       | 11.30ms   | 0.016           | 445.24ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_item_children             | 10.78ms   | 0.016           | 10.78ms  | 4649       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_lto_optimize                               | 10.27ms   | 0.015           | 10.27ms  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_register_crate                         | 8.46ms    | 0.012           | 10.62ms  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| unsafety_check_result                           | 7.96ms    | 0.012           | 433.35ms | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| predicates_of                                   | 6.32ms    | 0.009           | 11.49ms  | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_optimize_module_passes              | 6.29ms    | 0.009           | 6.29ms   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_lints                                     | 6.17ms    | 0.009           | 6.27ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| evaluate_obligation                             | 6.17ms    | 0.009           | 17.22ms  | 127        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_intrinsics                            | 6.12ms    | 0.009           | 6.12ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| resolve_lifetimes                               | 6.05ms    | 0.009           | 6.07ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_adt_def                   | 5.36ms    | 0.008           | 9.09ms   | 972        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| complete_gated_feature_checking                 | 5.13ms    | 0.007           | 5.13ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_attrs                                 | 4.87ms    | 0.007           | 5.16ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_private_in_public                         | 4.84ms    | 0.007           | 4.87ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_item_attrs                | 4.76ms    | 0.007           | 4.76ms   | 997        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_trait_ref            | 4.51ms    | 0.007           | 13.67ms  | 1572       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lint_levels                                     | 3.64ms    | 0.005           | 3.64ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_module_optimize                         | 3.51ms    | 0.005           | 17.82ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| death_checking                                  | 3.41ms    | 0.005           | 7.09ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| privacy_access_levels                           | 3.33ms    | 0.005           | 3.34ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| collect_mod_item_types                          | 3.17ms    | 0.005           | 13.84ms  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_const_bodies                          | 3.04ms    | 0.004           | 3.05ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_load_macro                             | 2.78ms    | 0.004           | 2.78ms   | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_loops                                 | 2.49ms    | 0.004           | 2.49ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_binary                                     | 2.48ms    | 0.004           | 376.31ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_optimize                            | 2.42ms    | 0.004           | 10.63ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| wf_checking                                     | 2.29ms    | 0.003           | 45.15ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| stability_index                                 | 2.21ms    | 0.003           | 2.21ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_codegen                             | 2.21ms    | 0.003           | 17.76ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| get_lib_features                                | 2.14ms    | 0.003           | 2.14ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_children                                   | 2.07ms    | 0.003           | 12.85ms  | 4649       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_module_optimize_function_passes            | 1.93ms    | 0.003           | 1.93ms   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| param_env                                       | 1.87ms    | 0.003           | 4.20ms   | 299        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_unstable_api_usage                    | 1.84ms    | 0.003           | 4.17ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_module                                  | 1.77ms    | 0.003           | 4.52ms   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| self_profile_alloc_query_strings                | 1.72ms    | 0.002           | 1.72ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_def_span                  | 1.71ms    | 0.002           | 1.71ms   | 324        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| visible_parent_map                              | 1.68ms    | 0.002           | 14.56ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| predicates_defined_on                           | 1.49ms    | 0.002           | 4.79ms   | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| trait_impls_of                                  | 1.41ms    | 0.002           | 2.13ms   | 26         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_crate                                   | 1.34ms    | 0.002           | 31.93ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| specializes                                     | 1.20ms    | 0.002           | 4.05ms   | 444        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_module_perform_lto                      | 1.10ms    | 0.002           | 25.78ms  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_generics_of               | 1.10ms    | 0.002           | 1.10ms   | 1571       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| setup_global_ctxt                               | 1.09ms    | 0.002           | 1.09ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| generics_of                                     | 1.08ms    | 0.002           | 8.27ms   | 2928       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_associated_item_def_ids   | 1.04ms    | 0.002           | 1.04ms   | 73         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_item_well_formed                          | 1.02ms    | 0.001           | 1.60ms   | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| parse_crate                                     | 952.44µs  | 0.001           | 952.44µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_op_prove_predicate                         | 922.96µs  | 0.001           | 1.48ms   | 32         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| explicit_predicates_of                          | 810.56µs  | 0.001           | 1.61ms   | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| eval_to_allocation_raw                          | 745.02µs  | 0.001           | 16.53ms  | 24         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_def                                         | 713.15µs  | 0.001           | 9.96ms   | 973        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_explicit_predicates_of    | 632.07µs  | 0.001           | 632.07µs | 382        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| inferred_outlives_crate                         | 617.87µs  | 0.001           | 1.19ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_optimized_mir             | 610.86µs  | 0.001           | 616.74µs | 28         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_trait_ref                                  | 577.01µs  | 0.001           | 14.25ms  | 1573       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_implementations_of_trait  | 551.24µs  | 0.001           | 551.24µs | 390        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| vtable_methods                                  | 550.76µs  | 0.001           | 2.79ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_fn_sig                    | 495.59µs  | 0.001           | 551.06µs | 38         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| def_kind                                        | 486.79µs  | 0.001           | 648.50µs | 1763       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_fn_attrs                                | 472.04µs  | 0.001           | 1.97ms   | 35         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_type_of                   | 453.09µs  | 0.001           | 635.36µs | 112        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| prepare_outputs                                 | 446.99µs  | 0.001           | 446.99µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| drop_compiler                                   | 444.75µs  | 0.001           | 444.75µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_of                                         | 440.27µs  | 0.001           | 1.72ms   | 1466       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_copy_raw                                     | 427.43µs  | 0.001           | 2.80ms   | 18         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| layout_raw                                      | 423.63µs  | 0.001           | 1.93ms   | 73         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_op_ascribe_user_type                       | 421.56µs  | 0.001           | 421.56µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| symbol_name                                     | 388.52µs  | 0.001           | 449.03µs | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| resolve_instance                                | 376.21µs  | 0.001           | 1.63ms   | 25         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| associated_items                                | 375.30µs  | 0.001           | 1.76ms   | 73         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| def_span                                        | 369.01µs  | 0.001           | 2.08ms   | 1681       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| inferred_outlives_of                            | 365.98µs  | 0.001           | 1.69ms   | 1739       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_binary_remove_temps                        | 335.10µs  | 0.000           | 335.10µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_diagnostic_items          | 311.90µs  | 0.000           | 311.90µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| monomorphization_collector_graph_walk           | 301.67µs  | 0.000           | 22.47ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_attrs                                      | 290.65µs  | 0.000           | 5.05ms   | 997        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_import                            | 268.71µs  | 0.000           | 268.71µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| optimized_mir                                   | 235.37µs  | 0.000           | 1.77ms   | 29         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lookup_deprecation_entry                        | 222.61µs  | 0.000           | 2.47ms   | 1364       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| visibility                                      | 213.70µs  | 0.000           | 222.95µs | 1377       |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_fulfill_obligation                      | 207.40µs  | 0.000           | 342.25µs | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_shims                                       | 199.51µs  | 0.000           | 311.84µs | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| associated_item                                 | 191.11µs  | 0.000           | 364.44µs | 524        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_trait_of_item             | 186.34µs  | 0.000           | 186.34µs | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link                                            | 185.41µs  | 0.000           | 376.54ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_impl_item_well_formed                     | 178.66µs  | 0.000           | 41.26ms  | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| specialization_graph_of                         | 178.13µs  | 0.000           | 1.79ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_global_analysis                   | 176.51µs  | 0.000           | 176.51µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| method_autoderef_steps                          | 170.77µs  | 0.000           | 490.56µs | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| normalize_projection_ty                         | 169.77µs  | 0.000           | 272.01µs | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_sized_raw                                    | 168.19µs  | 0.000           | 207.56µs | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_item_types                            | 167.81µs  | 0.000           | 1.92ms   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lit_to_const                                    | 165.91µs  | 0.000           | 173.81µs | 127        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_associated_item           | 165.58µs  | 0.000           | 165.58µs | 520        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| implementations_of_trait                        | 165.04µs  | 0.000           | 716.27µs | 390        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_def_kind                  | 161.72µs  | 0.000           | 161.72µs | 405        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| configure_and_expand                            | 153.05µs  | 0.000           | 550.58ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| issue33140_self_ty                              | 148.47µs  | 0.000           | 185.29µs | 242        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| write_allocator_module                          | 143.66µs  | 0.000           | 143.66µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_super_predicates_of       | 142.84µs  | 0.000           | 142.84µs | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_exported_symbols          | 140.77µs  | 0.000           | 140.77µs | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_parent               | 139.76µs  | 0.000           | 139.76µs | 99         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| promoted_mir                                    | 139.14µs  | 0.000           | 139.14µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_inferred_outlives_of      | 139.04µs  | 0.000           | 139.04µs | 382        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_polarity             | 138.74µs  | 0.000           | 138.74µs | 283        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_dtorck_constraint                           | 137.63µs  | 0.000           | 395.18µs | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_polarity                                   | 131.29µs  | 0.000           | 270.04µs | 284        |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_drops_elaborated_and_const_checked          | 128.22µs  | 0.000           | 131.60µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| normalize_generic_arg_after_erasing_regions     | 125.55µs  | 0.000           | 16.79ms  | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| erase_regions_ty                                | 122.30µs  | 0.000           | 166.87µs | 47         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| eval_to_const_value_raw                         | 116.10µs  | 0.000           | 33.23ms  | 44         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dropck_outlives                                 | 98.64µs   | 0.000           | 356.04µs | 11         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_place_roots                    | 97.67µs   | 0.000           | 142.77µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_freeze_raw                                   | 96.17µs   | 0.000           | 1.27ms   | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dependency_formats                              | 94.10µs   | 0.000           | 172.61µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| get_lang_items                                  | 90.85µs   | 0.000           | 136.02µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_reachable_non_generics    | 87.85µs   | 0.000           | 168.64µs | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| fn_sig                                          | 86.21µs   | 0.000           | 637.27µs | 43         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| associated_item_def_ids                         | 82.71µs   | 0.000           | 1.12ms   | 74         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| MIR_borrow_checking                             | 70.58µs   | 0.000           | 1.03s    | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| liveness_and_intrinsic_checking                 | 66.58µs   | 0.000           | 15.98s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_check_crate                                | 65.29µs   | 0.000           | 50.13s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| implied_outlives_bounds                         | 64.93µs   | 0.000           | 64.93µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_binary_check_files_are_writeable           | 63.53µs   | 0.000           | 63.53µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_lookup_stability          | 58.32µs   | 0.000           | 58.32µs  | 18         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| needs_drop_raw                                  | 57.40µs   | 0.000           | 2.41ms   | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| subst_and_check_impossible_predicates           | 52.18µs   | 0.000           | 174.74µs | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| create_global_ctxt                              | 50.79µs   | 0.000           | 1.14ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| monomorphization_collector_root_collections     | 49.96µs   | 0.000           | 544.10µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| exported_symbols                                | 48.17µs   | 0.000           | 188.94µs | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_keys                                        | 46.90µs   | 0.000           | 46.90µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_const_qualif                                | 45.75µs   | 0.000           | 45.75µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| macro_expand_crate                              | 41.54µs   | 0.000           | 373.23ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_naked_functions                       | 41.25µs   | 0.000           | 41.25µs  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| reachable_non_generics                          | 40.48µs   | 0.000           | 231.07µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| misc_checking_1                                 | 38.45µs   | 0.000           | 15.02ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_sized_constraint                            | 37.81µs   | 0.000           | 107.34µs | 12         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_profiler_runtime                             | 37.34µs   | 0.000           | 38.98µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| mir_abstract_const                              | 37.07µs   | 0.000           | 37.07µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| type_collecting                                 | 35.89µs   | 0.000           | 13.87ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| inherent_impls                                  | 34.98µs   | 0.000           | 45.76µs  | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| collect_and_partition_mono_items                | 34.90µs   | 0.000           | 23.73ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_injection                                 | 34.77µs   | 0.000           | 34.77µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_parent                                     | 33.95µs   | 0.000           | 173.71µs | 99         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_merge_cgus                     | 33.84µs   | 0.000           | 33.84µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_trait_def                 | 33.56µs   | 0.000           | 33.56µs  | 19         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| misc_checking_3                                 | 31.03µs   | 0.000           | 132.92ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_destructor                                  | 30.51µs   | 0.000           | 1.75ms   | 9          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_late_bound_map                               | 30.32µs   | 0.000           | 30.32µs  | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| unused_lib_feature_checking                     | 30.27µs   | 0.000           | 2.17ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_lookup_deprecation_entry  | 29.89µs   | 0.000           | 29.89µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| trait_def                                       | 29.77µs   | 0.000           | 63.33µs  | 19         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_rename                            | 28.35µs   | 0.000           | 28.35µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_adt_destructor            | 27.62µs   | 0.000           | 56.79µs  | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_reachable_non_generic                        | 27.56µs   | 0.000           | 258.63µs | 14         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| variances_of                                    | 27.33µs   | 0.000           | 58.53µs  | 8          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| supported_target_features                       | 27.31µs   | 0.000           | 27.31µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_mir_available                                | 27.18µs   | 0.000           | 90.69µs  | 28         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| assert_symbols_are_distinct                     | 26.36µs   | 0.000           | 444.41µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| expn_that_defined                               | 26.09µs   | 0.000           | 51.85µs  | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_expn_that_defined         | 25.77µs   | 0.000           | 25.77µs  | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| object_lifetime_defaults_map                    | 25.27µs   | 0.000           | 6.10ms   | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_mod_impl_wf                               | 23.46µs   | 0.000           | 23.46µs  | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| trait_of_item                                   | 23.36µs   | 0.000           | 209.70µs | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| join_worker_thread                              | 22.55µs   | 0.000           | 22.55µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_foreign_item                                 | 22.52µs   | 0.000           | 28.07µs  | 13         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| adt_drop_tys                                    | 22.45µs   | 0.000           | 156.42µs | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| assert_dep_graph                                | 20.73µs   | 0.000           | 20.73µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lookup_stability                                | 20.11µs   | 0.000           | 78.43µs  | 19         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| index_hir                                       | 19.04µs   | 0.000           | 45.88ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_owner_nodes                                 | 18.93µs   | 0.000           | 18.93µs  | 7          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| typeck_item_bodies                              | 18.88µs   | 0.000           | 50.06s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_variances                                 | 18.73µs   | 0.000           | 18.73µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| looking_for_entry_point                         | 18.73µs   | 0.000           | 31.09µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning                                | 18.28µs   | 0.000           | 224.60µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_panic_runtime                                | 18.10µs   | 0.000           | 21.03µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| native_libraries                                | 18.05µs   | 0.000           | 31.80µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| match_checking                                  | 17.68µs   | 0.000           | 158.72ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| coherent_trait                                  | 17.51µs   | 0.000           | 1.66ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| reachable_set                                   | 17.23µs   | 0.000           | 17.23µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| MIR_effect_checking                             | 17.15µs   | 0.000           | 17.15µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_name                                      | 17.02µs   | 0.000           | 18.21µs  | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_unit                                    | 16.99µs   | 0.000           | 16.99µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_internalize                       | 16.86µs   | 0.000           | 16.86µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| coherence_checking                              | 16.76µs   | 0.000           | 51.14µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_mir_available          | 16.62µs   | 0.000           | 16.62µs  | 27         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| maybe_building_test_harness                     | 16.04µs   | 0.000           | 16.04µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_place_inline_items             | 15.30µs   | 0.000           | 15.30µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| codegen_generate_lto_work                       | 15.26µs   | 0.000           | 194.44µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| static_mutability                               | 15.13µs   | 0.000           | 19.83µs  | 21         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| maybe_create_a_macro_crate                      | 14.72µs   | 0.000           | 14.72µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| super_predicates_of                             | 14.55µs   | 0.000           | 157.38µs | 10         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| defined_lang_items                              | 14.29µs   | 0.000           | 23.70µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_owner                                       | 14.18µs   | 0.000           | 45.89ms  | 11         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_missing_extern_crate_item | 13.95µs   | 0.000           | 13.95µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_native_libraries          | 13.75µs   | 0.000           | 13.75µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_inherent_impls                            | 13.15µs   | 0.000           | 13.15µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| looking_for_derive_registrar                    | 12.71µs   | 0.000           | 19.85µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| looking_for_plugin_registrar                    | 12.59µs   | 0.000           | 19.10µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_variances_of              | 12.47µs   | 0.000           | 12.47µs  | 7          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| entry_fn                                        | 12.36µs   | 0.000           | 12.36µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dep_kind                                        | 11.59µs   | 0.000           | 14.99µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| panic_strategy                                  | 11.51µs   | 0.000           | 12.41µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| backend_optimization_level                      | 10.97µs   | 0.000           | 10.97µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_resolve_weak                      | 10.97µs   | 0.000           | 10.97µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| missing_extern_crate_item                       | 10.87µs   | 0.000           | 24.82µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| normalize_opaque_types                          | 10.85µs   | 0.000           | 10.85µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| used_crate_source                               | 10.81µs   | 0.000           | 20.49µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_inherent_impls            | 10.77µs   | 0.000           | 10.77µs  | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| upvars_mentioned                                | 9.89µs    | 0.000           | 9.89µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| module_exports                                  | 9.86µs    | 0.000           | 9.86µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_used_crate_source         | 9.68µs    | 0.000           | 9.68µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_inherent_impls_overlap_check              | 9.42µs    | 0.000           | 13.43µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_defined_lang_items        | 9.41µs    | 0.000           | 9.41µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_visibility                | 9.24µs    | 0.000           | 9.24µs   | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| parent_module_from_def_id                       | 9.19µs    | 0.000           | 9.19µs   | 6          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| finish_ongoing_codegen                          | 9.07µs    | 0.000           | 31.61µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| extern_crate                                    | 8.95µs    | 0.000           | 9.65µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_module_items                                | 8.69µs    | 0.000           | 8.69µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| all_crate_nums                                  | 8.26µs    | 0.000           | 8.26µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_args                                       | 8.09µs    | 0.000           | 8.09µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| original_crate_name                             | 7.96µs    | 0.000           | 8.15µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| crate_disambiguator                             | 7.78µs    | 0.000           | 7.91µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| hir_crate                                       | 7.59µs    | 0.000           | 7.59µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| privacy_checking_modules                        | 7.38µs    | 0.000           | 51.19ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| instance_def_size_estimate                      | 7.25µs    | 0.000           | 7.25µs   | 13         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| missing_lang_items                              | 7.18µs    | 0.000           | 13.22µs  | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| cgu_partitioning_internalize_symbols            | 7.16µs    | 0.000           | 7.16µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| proc_macro_decls_static                         | 7.14µs    | 0.000           | 7.14µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| postorder_cnums                                 | 7.02µs    | 0.000           | 7.02µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| partition_and_assert_distinct_symbols           | 7.01µs    | 0.000           | 676.02µs | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_const_fn_raw                                 | 6.91µs    | 0.000           | 6.91µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_wf_inference                               | 6.82µs    | 0.000           | 30.28µs  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| symbol_mangling_version                         | 6.53µs    | 0.000           | 6.93µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| plugin_registrar_fn                             | 6.51µs    | 0.000           | 6.51µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_compiler_builtins                            | 6.50µs    | 0.000           | 7.29µs   | 16         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| opt_const_param_of                              | 6.49µs    | 0.000           | 6.49µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| module_lints                                    | 6.18µs    | 0.000           | 57.97ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| features_query                                  | 6.08µs    | 0.000           | 6.08µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_missing_lang_items        | 6.04µs    | 0.000           | 6.04µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_foreign_item           | 5.55µs    | 0.000           | 5.55µs   | 13         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| named_region_map                                | 5.45µs    | 0.000           | 5.45µs   | 4          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| all_local_trait_impls                           | 5.27µs    | 0.000           | 5.27µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| serialize_work_products                         | 5.26µs    | 0.000           | 5.26µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| lint_checking                                   | 5.21µs    | 0.000           | 64.24ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_codegened_item                               | 5.15µs    | 0.000           | 5.15µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| orphan_checking                                 | 5.10µs    | 0.000           | 5.10µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| output_filenames                                | 5.09µs    | 0.000           | 5.09µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| diagnostic_items                                | 4.89µs    | 0.000           | 316.79µs | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_types_checking                             | 4.78µs    | 0.000           | 1.93ms   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_static_mutability         | 4.70µs    | 0.000           | 4.70µs   | 20         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| misc_checking_2                                 | 4.63µs    | 0.000           | 16.14s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| impl_defaultness                                | 4.41µs    | 0.000           | 5.10µs   | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| is_no_builtins                                  | 4.39µs    | 0.000           | 5.17µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| extern_mod_stmt_cnum                            | 4.38µs    | 0.000           | 4.38µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| in_scope_traits_map                             | 4.29µs    | 0.000           | 4.29µs   | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| item_bodies_checking                            | 3.89µs    | 0.000           | 50.06s   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| serialize_dep_graph                             | 3.78µs    | 0.000           | 3.78µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| link_crate                                      | 3.77µs    | 0.000           | 376.32ms | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| recursion_limit                                 | 3.71µs    | 0.000           | 3.71µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_dep_kind                  | 3.40µs    | 0.000           | 3.40µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| param_env_reveal_all_normalized                 | 3.39µs    | 0.000           | 3.39µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| <unknown>                                       | 3.34µs    | 0.000           | 3.34µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| find_cgu_reuse                                  | 3.24µs    | 0.000           | 3.24µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_panic_runtime          | 2.93µs    | 0.000           | 2.93µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| used_trait_imports                              | 2.71µs    | 0.000           | 2.71µs   | 5          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| unsafety_checking                               | 2.71µs    | 0.000           | 2.71µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_lto_generate_symbols_below_threshold       | 2.67µs    | 0.000           | 2.67µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| check_unused_macros                             | 2.53µs    | 0.000           | 2.53µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| attributes_injection                            | 2.42µs    | 0.000           | 2.42µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| maybe_unused_extern_crates                      | 2.37µs    | 0.000           | 2.37µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| monomorphization_collector                      | 2.35µs    | 0.000           | 23.02ms  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_profiler_runtime       | 1.64µs    | 0.000           | 1.64µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| plugin_loading                                  | 1.62µs    | 0.000           | 1.62µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| dep_graph_tcx_init                              | 1.61µs    | 0.000           | 1.61µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_crate_name                | 1.19µs    | 0.000           | 1.19µs   | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| layout_testing                                  | 1.01µs    | 0.000           | 1.01µs   | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| has_typeck_results                              | 988.00ns  | 0.000           | 988.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_panic_strategy            | 899.00ns  | 0.000           | 899.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_compiler_builtins      | 797.00ns  | 0.000           | 797.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_is_no_builtins            | 775.00ns  | 0.000           | 775.00ns | 15         |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| write_crate_metadata                            | 771.00ns  | 0.000           | 771.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| LLVM_thin_lto_patch_debuginfo                   | 724.00ns  | 0.000           | 724.00ns | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_extern_crate              | 699.00ns  | 0.000           | 699.00ns | 3          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_impl_defaultness          | 693.00ns  | 0.000           | 693.00ns | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_symbol_mangling_version   | 399.00ns  | 0.000           | 399.00ns | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| drop_dep_graph                                  | 291.00ns  | 0.000           | 291.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_original_crate_name       | 192.00ns  | 0.000           | 192.00ns | 2          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| llvm_dump_timing_file                           | 184.00ns  | 0.000           | 184.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| metadata_decode_entry_crate_disambiguator       | 132.00ns  | 0.000           | 132.00ns | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
| plugin_registration                             | 83.00ns   | 0.000           | 83.00ns  | 1          |
+-------------------------------------------------+-----------+-----------------+----------+------------+
Total cpu time: 68.770408871s
```

</p>
</details>

### Meta
<!--
If you're using the stable version of the compiler, you should also check if the
bug also exists in the beta or nightly versions.
-->

`rustc --version --verbose`:
```
rustc 1.50.0-nightly (6645da366 2020-12-01)
binary: rustc
commit-hash: 6645da366eed0c61258a04265bea513e94df7ea6
commit-date: 2020-12-01
host: x86_64-apple-darwin
release: 1.50.0-nightly
```

This issue occurs for `stable` as well. I have not tried `beta`. It also appears in windows builds.

Thanks for your time, and let me know if there's anything else I can do to help identify the issue!