[PATCH] D20401: [Lexer] Don't merge macro args from different macro files

[Vedant Kumar via cfe-commits]

vsk updated this revision to Diff 57711.
vsk added a comment.

- Add some comments to the unit test.


http://reviews.llvm.org/D20401

Files:
  lib/Lex/TokenLexer.cpp
  test/CoverageMapping/Inputs/macros.h
  test/CoverageMapping/include-macros.c
  unittests/Lex/LexerTest.cpp

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