Richard Smith dbafb6c338 Teach ASTReader how to read only the Preprocessor state from an AST file, not the ASTContext state. ...

We use this when running a preprocessor-only action on an AST file in order to
avoid paying the runtime cost of loading the extra information.

llvm-svn: 306760

2017-06-29 23:23:46 +00:00

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