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Try to convert two compares of a signed range check into a single unsigned compare. Examples: (icmp sge x, 0) & (icmp slt x, n) --> icmp ult x, n (icmp slt x, 0) | (icmp sgt x, n) --> icmp ugt x, n git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223224 91177308-0d34-0410-b5e6-96231b3b80d8