[PATCH] D27545: Don't assert when redefining a built-in macro in a PCH, PR29119

[Nico Weber via Phabricator via cfe-commits]

thakis updated this revision to Diff 80849.
thakis added a comment.

update a comment


https://reviews.llvm.org/D27545

Files:
  include/clang/Lex/Preprocessor.h
  lib/Lex/PPMacroExpansion.cpp
  lib/Serialization/ASTReader.cpp
  test/PCH/builtin-macro.c

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