[PATCH] MC Win64: Put unwind info for COMDAT code into the same COMDAT group

[Reid Kleckner]

Hi majnemer,

This fixes a long standing issue where we would emit many little .text
sections and only one .pdata and .xdata section. Now we generate one
.pdata / .xdata pair per .text section and associate them correctly.

Fixes PR19667.

http://reviews.llvm.org/D5181

Files:
  include/llvm/MC/MCContext.h
  include/llvm/MC/MCWinEH.h
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/MC/MCAsmStreamer.cpp
  lib/MC/MCContext.cpp
  lib/MC/MCWin64EH.cpp
  lib/MC/MCWinEH.cpp
  test/MC/COFF/seh-linkonce.s
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