[PATCH] MC: Better management of macro arguments

[David Majnemer]

Hi rafael, grosbach,

The linux kernel makes uses of a GAS `feature' which substitutes nothing
for macro arguments which aren't specified.

Proper support for these kind of macro arguments necessitated a cleanup of
differences between `GAS' and `Darwin' dialect macro processing.

The test file has been split into so that conflicting differences
between the two can be sorted out cleanly (for example: `GNU' permits the
use of space as an argument separator but `Darwin' does not.)

http://llvm-reviews.chandlerc.com/D2634

Files:
  lib/MC/MCParser/AsmParser.cpp
  test/MC/AsmParser/darwin_macros.s
  test/MC/AsmParser/macros.s
  test/MC/AsmParser/gas_macros.s
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