Richard Smith d79514e24b [modules] Separately track whether an identifier's preprocessor information and ...

name lookup information have changed since deserialization. For a C++ modules
build, we do not need to re-emit the identifier into the serialized identifier
table if only the name lookup information has changed (and in all cases, we
don't need to re-emit the macro information if only the name lookup information
has changed).

llvm-svn: 259901

2016-02-05 19:03:40 +00:00

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