Chris Lattner ca8ebc095b improve comments, implement a trivial single-entry cache in ...

SourceManager::getInstantiationLoc.  With this change, every token
expanded from a macro doesn't get its own MacroID.  :)

This reduces # macro IDs in carbon.h from 16805 to 9197

llvm-svn: 40108

2007-07-20 18:00:12 +00:00

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