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99e941fd9a
We can prove that a 'sub' can be a 'sub nuw' if the left-hand side is negative and the right-hand side is non-negative. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216045 91177308-0d34-0410-b5e6-96231b3b80d8