[PATCH] WinCOFF: Emit common symbols as specified in the COFF spec

[David Majnemer]

Hi Bigcheese, rafael, rnk,

Local common symbols were properly inserted into the .bss section.
However, putting external common symbols in the .bss section would give
them a strong definition.

Instead, encode them as undefined, external symbols who's symbol value
is equivalent to their size.

http://reviews.llvm.org/D3324

Files:
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/MC/MCObjectFileInfo.cpp
  lib/MC/WinCOFFObjectWriter.cpp
  lib/MC/WinCOFFStreamer.cpp
  test/MC/COFF/comm.ll
  test/MC/COFF/comm.s
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