[PATCH] MC: Implement COFF .linkonce directive

[Nico Rieck]

  Produce a diagnostic if .linkonce is specified multiple times. Also addressed
  the other comments.

http://llvm-reviews.chandlerc.com/D1100

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1100?vs=2692&id=2696#toc

Files:
  docs/Extensions.rst
  include/llvm/MC/MCContext.h
  include/llvm/MC/MCSectionCOFF.h
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/MC/MCContext.cpp
  lib/MC/MCParser/COFFAsmParser.cpp
  lib/MC/MCSectionCOFF.cpp
  lib/MC/WinCOFFObjectWriter.cpp
  lib/MC/WinCOFFStreamer.cpp
  test/MC/COFF/linkonce-invalid.s
  test/MC/COFF/linkonce.s
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