[PATCH] [Modules] Teach Clang to survive ambiguous macros which come from system headers even if they arrived when merging non-system modules.

[Chandler Carruth]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8310

Files:
  cfe/trunk/lib/Serialization/ASTReader.cpp
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/a/quote/a_quote.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/a/system/a_system.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/b/quote/b_quote.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/b/system/b_system.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/c/quote/c_quote.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/c/system/c_system.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/d/quote/d_quote.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/d/system/d_system.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/e/quote/e_quote.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/e/system/e_system.h
  cfe/trunk/test/Modules/Inputs/macro-ambiguity/module.modulemap
  cfe/trunk/test/Modules/macro-ambiguity.cpp

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