Chris Lattner 09713794c1 pull the predMap densemap out of the inner loop of performPRE, so
that it isn't reallocated all the time.  This is a tiny speedup for
GVN: 3.90->3.88s


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60338 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-01 07:29:03 +00:00
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