[PATCH] IR: Add COMDATs to the IR

[David Majnemer]

Hi rnk, rafael, nicholas,

This new IR facility allows us to represent the object-file semantic of
a COMDAT group.

COMDATs allow us to tie together sections and make the inclusion of one
dependent on another.  This is required to implement features like MS
ABI VFTables and optimizing away certain kinds of initialization in C++.

This functionality is only representable in COFF and ELF, Mach-O has no
similar mechanism.

http://reviews.llvm.org/D4094

Files:
  docs/LangRef.rst
  include/llvm-c/Core.h
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/Comdat.h
  include/llvm/IR/Function.h
  include/llvm/IR/GlobalAlias.h
  include/llvm/IR/GlobalValue.h
  include/llvm/IR/GlobalVariable.h
  include/llvm/IR/Module.h
  include/llvm/IR/Type.h
  include/llvm/IR/Value.h
  include/llvm/IR/ValueSymbolTable.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/Core.cpp
  lib/IR/Function.cpp
  lib/IR/Globals.cpp
  lib/IR/LLVMContextImpl.cpp
  lib/IR/LLVMContextImpl.h
  lib/IR/Module.cpp
  lib/IR/Type.cpp
  lib/IR/Value.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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