Douglas Gregor 99734e7669 Lazily load the controlling macros for all of the headers known in the ...

PCH file. In the Cocoa-prefixed "Hello, World" benchmark, this takes
us from reading 503 identifiers down to 37 and from 470 macros down to
4. It also results in an 8% performance improvement.

llvm-svn: 70094

2009-04-25 23:30:02 +00:00

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