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39c27eddc5
improvements to the EvaluateInDifferentType code. This code works by just inserted a bunch of new code and then seeing if it is useful. Instcombine is not allowed to do this: it can only insert new code if it is useful, and only when it is converging to a more canonical fixed point. Now that we iterate when DCE makes progress, this causes an infinite loop when the code ends up not being used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63483 91177308-0d34-0410-b5e6-96231b3b80d8