[PATCH] Alternative way of representing comdats

[Rafael Ávila de Espíndola]

Hi nicholas, rnk, majnemer,

This is a variation on http://reviews.llvm.org/D4094

I think it is at feature parity. In particular, lib/Linker has not been updated and passes have not been audited to not modify the set of symbols in a comdat.

What it does is change the representation to not be a Value. It is intended as a way of making a discussion about these treadeoffs more concrete.

http://reviews.llvm.org/D4178

Files:
  docs/LangRef.rst
  include/llvm-c/Core.h
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/Comdat.h
  include/llvm/IR/GlobalObject.h
  include/llvm/IR/GlobalValue.h
  include/llvm/IR/Module.h
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLLexer.h
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/AsmParser/LLToken.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Reader/BitcodeReader.h
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/Bitcode/Writer/ValueEnumerator.cpp
  lib/Bitcode/Writer/ValueEnumerator.h
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/IR/AsmWriter.cpp
  lib/IR/AsmWriter.h
  lib/IR/CMakeLists.txt
  lib/IR/Comdat.cpp
  lib/IR/Globals.cpp
  lib/IR/Module.cpp
  test/Feature/comdat.ll
  test/Instrumentation/AddressSanitizer/do-not-instrument-llvm-metadata.ll
  test/MC/COFF/comdat.ll
  test/MC/ELF/comdat.ll
  test/MC/MachO/comdat.ll
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