[PATCH] CodeGen: Stick constant pool entries in COMDAT sections for WinCOFF

[David Majnemer]

Hi rafael, rnk, grosbach, echristo,

COFF lacks a feature that other object file formats support: mergeable
sections.

To work around this, MSVC sticks constant pool entries in special COMDAT
sections so that each constant is in it's own section.  This permits
unused constants to be dropped and it also allows duplicate constants in
different translation units to get merged together.

This fixes PR20262.

http://reviews.llvm.org/D4482

Files:
  include/llvm/ADT/StringExtras.h
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/CodeGen/MachineConstantPool.h
  include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
  include/llvm/MC/MCSectionCOFF.h
  include/llvm/Target/TargetLoweringObjectFile.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/MachineFunction.cpp
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/MC/MCContext.cpp
  lib/Target/NVPTX/NVPTXTargetObjectFile.h
  lib/Target/TargetLoweringObjectFile.cpp
  lib/Target/X86/X86AsmPrinter.cpp
  lib/Target/X86/X86AsmPrinter.h
  lib/Target/X86/X86TargetObjectFile.cpp
  lib/Target/X86/X86TargetObjectFile.h
  lib/Target/XCore/XCoreTargetObjectFile.cpp
  lib/Target/XCore/XCoreTargetObjectFile.h
  test/CodeGen/X86/constant-pool-sharing.ll
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