[PATCH] D15670: Accept elided commas in macro function arguments for MS compatibility

[Ehsan Akhgari via cfe-commits]

ehsan created this revision.
ehsan added reviewers: rnk, rsmith.
ehsan added a subscriber: cfe-commits.

This fixes PR25875.  When the trailing comma in a macro argument list is
elided, we need to treat it similarly to the case where a variadic macro
misses one actual argument.

http://reviews.llvm.org/D15670

Files:
  include/clang/Lex/Token.h
  lib/Lex/PPMacroExpansion.cpp
  lib/Lex/TokenLexer.cpp
  test/Preprocessor/microsoft-ext.c

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