Justin Bogner ad69e64761 InstrProf: Avoid linear search in a hot loop
Every time we were adding or removing an expression when generating a
coverage mapping we were doing a linear search to try and deduplicate
the list. The indices in the list are important, so we can't just
replace it by a DenseMap entirely, but an auxilliary DenseMap for fast
lookup massively improves the performance issues I was seeing here.

llvm-svn: 218892
2014-10-02 17:14:18 +00:00
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