martong added a comment.

In https://reviews.llvm.org/D47698#1140629, @thakis wrote:
> This code is live when reading pchs, correct? Does this have any measurable 
> perf impact on deserializing pchs for, say, Cocoa.h or Windows.h?


No. The deserialization of a PCH is handled in a completely independent source 
code. ASTImporter is responsible to merge two ASTs. These ASTs may come from a 
PCH - deserialized - , or they may be provided by the parser; from the 
ASTImporer's point of view this is irrelevant. Thus, there is no performance 
impact on deserialization of PCHs.


Repository:
  rC Clang

https://reviews.llvm.org/D47698



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