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1af442e572
add recurrences don't overflow. This change makes the optimization more restrictive. It still assumes that an overflowing `add nsw` is undefined behavior; and this change will need revisiting once we have a consistent semantics for poison values. Differential Revision: http://reviews.llvm.org/D7331 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228552 91177308-0d34-0410-b5e6-96231b3b80d8