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* fix PR8642: if a critical edge has a PHI value that can trap,Chris Lattner2010-12-191-0/+29
isel is *required* to split the edge. PHI values get evaluated on the edge, not in their predecessor block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122170 91177308-0d34-0410-b5e6-96231b3b80d8