Use a cache in TypedefDecl to make ASTContext::getTypedefType trivial.
This speeds up parsing carbon.h from 16.0s to 11.3s, reducing slow lookups from 63K to 32K. llvm-svn: 39308
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This speeds up parsing carbon.h from 16.0s to 11.3s, reducing slow lookups from 63K to 32K. llvm-svn: 39308