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43a5aa62d4
When the compare feeding a branch was in a different BB from the branch, we'd try to "regenerate" the compare in the block with the branch, possibly trying to make use of values not available there. Copy a page from AArch64's play book here to fix the problem (at least in terms of correctness). Fixes PR23640. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238097 91177308-0d34-0410-b5e6-96231b3b80d8