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shuffle lowering: match shuffle patterns equivalent to an unpcklwd or unpckhwd instruction. This allows us to use generic lowering code for v8i16 shuffles and match the unpack pattern late. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212705 91177308-0d34-0410-b5e6-96231b3b80d8