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Without this change, the llvm_unreachable kicked in. The code pattern being spotted is rather non-canonical for 128-bit MLAs, but it can happen and there's no point in generating sub-optimal code for it just because it looks odd. Should fix PR19332. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205615 91177308-0d34-0410-b5e6-96231b3b80d8