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25e8e79fab
WillNotOverflowUnsignedMul's smarts will live in ValueTracking as computeOverflowForUnsignedMul. It now returns a tri-state result: never overflows, always overflows and sometimes overflows. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225076 91177308-0d34-0410-b5e6-96231b3b80d8
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