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Summary: Merge overflow computation for signed add, appearing both in InstCombine and ValueTracking. As part of the merge, cleanup the interface for overflow checks in InstCombine. Patch by Yoav Ben-Shalom. Reviewers: craig.topper, majnemer Reviewed By: craig.topper Subscribers: takuto.ikuta, llvm-commits Differential Revision: https://reviews.llvm.org/D32946 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303029 91177308-0d34-0410-b5e6-96231b3b80d8
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