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645fd68c5c
ReplaceInstUsesWith needs to return nullptr when the input has no users, because in that case it does not mutate the program. Otherwise, we can get stuck in an infinite loop of repeatedly attempting to constant fold and instruction with no users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231755 91177308-0d34-0410-b5e6-96231b3b80d8
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