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[SCEV] Simplify umin/max of zext and sext of the same value
This is a common idiom which arises after induction variables are widened, and we have two or more exit conditions. Interestingly, we don't have instcombine or instsimplify support for this either. Differential Revision: https://reviews.llvm.org/D69006 llvm-svn: 375349
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