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It is not sound to mark the increment operation as `nuw` or `nsw` based on a proof off of the add recurrence if the increment operation we emit happens to be a `sub` instruction. I could not come up with a test case for this -- the cases where SCEVExpander decides to emit a `sub` instruction is quite small, and I cannot think of a way I'd be able to get SCEV to prove that the increment does not overflow in those cases. Differential Revision: http://reviews.llvm.org/D7899 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230673 91177308-0d34-0410-b5e6-96231b3b80d8
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