Revamp doc index

Fixes #14972
Add unwrap method to MoveItems
rustc: Refactor middle::trans::inline
Fix ICE with trans of calls to foreign fns

It was failing occasionally.
mark win32 binaries as large address aware

By default, 32-bit Windows executables are restricted to 2GiB of address
space even when running on 64-bit Windows when 4GiB is available.

Closes #17043
Fix vector/array/slice terminology in manual.

Fixes #16015.
Register snapshots.

Closes #16880.
enable jemalloc debugging in unoptimized builds

The performance hit from these checks is significant, but unoptimized
builds are already incredibly slow. Enabling these checks results in
better test coverage since there are bots doing unoptimized builds, and
the cost is relatively small in the context of an unoptimized build.
This also allows using `JEMALLOC_FLAGS` to override the default
configure flags.
Forbid unsized rvalues

Closes #16813
auto merge of #16933 : nick29581/rust/dst-rvalue, r=nikomatsakis

Closes #16813 

r? @nikomatsakis I feel like I should be checking more things in check_rvalues, but not sure what - I don't properly understand expr_use_visitor
auto merge of #17036 : pczarn/rust/issue-15913-ICE-with-call-trans, r=alexcrichton

A match in callee.rs was recognizing some foreign fns as named tuple constructors. A reproducible test case for this is nearly impossible since it depends on the way NodeIds happen to be assigned in different crates.

Fixes #15913
rand: inform the optimiser that indexing is never out-of-bounds.

This uses a bitwise mask to ensure that there's no bounds checking for
the array accesses when generating the next random number. This isn't
costless, but the single instruction is nothing compared to the branch.

A `debug_assert` for "bounds check" is preserved to ensure that
refactoring doesn't accidentally break it (i.e. create values of `cnt`
that are out of bounds with the masking causing it to silently wrap-
around).

Before:

    test test::rand_isaac   ... bench: 990 ns/iter (+/- 24) = 808 MB/s
    test test::rand_isaac64 ... bench: 614 ns/iter (+/- 25) = 1302 MB/s

After:

    test test::rand_isaac   ... bench: 877 ns/iter (+/- 134) = 912 MB/s
    test test::rand_isaac64 ... bench: 470 ns/iter (+/- 30) = 1702 MB/s

(It also removes the unsafe code in Isaac64Rng.next_u64, with a *gain*
in performance; today is a good day.)
auto merge of #17063 : huonw/rust/snap, r=alexcrichton

Closes #16880.
auto merge of #17053 : thestinger/rust/large_address_aware, r=sfackler,cmr

By default, 32-bit Windows executables are restricted to 2GiB of address
space even when running on 64-bit Windows when 4GiB is available.

Closes #17043
rustc: use a TypedArena to allocate types in the type context.
rustc: fix fallout from the addition of a 'tcx lifetime on tcx.
rustc: fix fallout from the addition of a 'tcx lifetime on trans::Block.
rustdoc: fix fallout from the addition of a 'tcx lifetime on tcx.
auto merge of #16903 : mahkoh/rust/move_items_unwrap, r=aturon

Closes #16879
Update LLVM to fix a crash in the MergeFunc pass