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Commit 77e05fe2 authored by Chris Lattner's avatar Chris Lattner
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Switch the internal "Info" map from an std::map to a DenseMap. This 

speeds up idom by about 45% and postidom by about 33%.

Some extra precautions must be taken not to invalidate densemap iterators.

llvm-svn: 40827
parent bd0fe01d
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