[PATCH] [MC] [IAS] Add support for the \@ .macro pseudo-variable.

[Toma Tabacu]

Hi rafael, echristo,

When used, it is instantiated as the number of existing .macro definitions at the time when its .macro was defined.
So if it's inside the 1st defined .macro, \@ will instantiate to 0, if it's inside the 2nd .macro definition, it will instantiate to 1 etc.

It can only be used inside a .macro definition.

http://reviews.llvm.org/D9197

Files:
  lib/MC/MCParser/AsmParser.cpp
  test/MC/AsmParser/at-pseudo-variable-bad.s
  test/MC/AsmParser/at-pseudo-variable.s

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