Revert "Fix overly aggressive type merging."

This reverts commit r222727, which causes LTO bootstrap failures.

Last passing @ r222698:
http://lab.llvm.org:8080/green/job/clang-Rlto_master_build/532/

First failing @ r222843:
http://lab.llvm.org:8080/green/job/clang-Rlto_master_build/533/

Internal bootstraps pointed at a much narrower range: r222725 is
passing, and r222731 is failing.

LTO crashes while handling libclang.dylib:
http://lab.llvm.org:8080/green/job/clang-Rlto_master_build/533/consoleFull#-158682280549ba4694-19c4-4d7e-bec5-911270d8a58c

    GEP is not of right type for indices!
      %InfoObj.i.i = getelementptr inbounds %"class.llvm::OnDiskIterableChainedHashTable"* %.lcssa, i64 0, i32 0, i32 4, !dbg !123627
     %"class.clang::serialization::reader::ASTIdentifierLookupTrait" = type { %"class.clang::ASTReader.31859"*, %"class.clang::serialization::ModuleFile.31870"*, %"class.clang::IdentifierInfo"* }LLVM ERROR: Broken function found, compilation aborted!
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

Looks like the new algorithm doesn't merge types aggressively enough.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222895 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Reapply 222538 and update tests to explicitly request small code model and PIC:"

This reverts commit r222760.

It changed our behaviour on PIC so we don't match gas anymore. It also
included lots of unnecessary changes to tests.

If those changes are desirable, there should be an independent discussion
as they are out of scope for that patch.

I will recommit the other bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222896 91177308-0d34-0410-b5e6-96231b3b80d8
Commit back the correct bits of r222760 (was r222538).

I also added a test.

Original message:

Allow FDE references outside the +/-2GB range supported by PC relative
offsets for code models other than small/medium. For JIT application,
memory layout is less controlled and can result in truncations
otherwise.

Patch from Akos Kiss.

Differential Revision: http://reviews.llvm.org/D6079

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222897 91177308-0d34-0410-b5e6-96231b3b80d8
Widen ELFYAML relocation type to 32 bits

The current 8 bits is sufficient for ELF32 targets but ELF64 requires
32 bits. Add a test for AArch64 that exposes the issue.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222898 91177308-0d34-0410-b5e6-96231b3b80d8