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test. This was just a matter of the DAG combine for vector shuffles being too aggressive. This is a bit of a grey area, but I think generally if we can re-use intermediate shuffles, we should. Certainly, given the test cases I have available, this seems like the right call. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229285 91177308-0d34-0410-b5e6-96231b3b80d8
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