[PATCH] MC: Add .section directive to COFF

[Nico Rieck]

Supports GAS flags "abdnrswxy" with identical result in COFF section flags. No support for alignment or subsections.

No changes to the printed flags when generating asm (there also doesn't seem to be a sane way to make these flags roundtrip).

It also doesn't accept extended ASCII like GAS does, but that's a lexer issue.

http://llvm-reviews.chandlerc.com/D666

Files:
  lib/MC/MCParser/COFFAsmParser.cpp
  test/MC/COFF/section.s
  test/MC/COFF/seh-section.s
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