[PATCH] Add comdat key field to llvm.global_ctors and llvm.global_dtors

[Reid Kleckner]

Hi nicholas, nlewycky,

This allows us to put dynamic initializers for weak data into the same
comdat group as the data being initialized.  This is necessary for MSVC
ABI compatibility.  It should also allow GlobalOpt to fire more often
weak data on other platforms if we can sort out the initialization of
the guard variable.

http://reviews.llvm.org/D3499

Files:
  docs/LangRef.rst
  include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
  include/llvm/Target/TargetLoweringObjectFile.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/IR/Verifier.cpp
  lib/Transforms/IPO/GlobalOpt.cpp
  test/MC/COFF/global_ctors_dtors.ll
  test/Transforms/GlobalOpt/ctor-list-opt.ll
  test/Verifier/global-ctors.ll
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