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b7012af85f
systematic lowering of v8i16. This required a slight strategy shift to prefer unpack lowerings in more places. While this isn't a cut-and-dry win in every case, it is in the overwhelming majority. There are only a few places where the old lowering would probably be a touch faster, and then only by a small margin. In some cases, this is yet another significant improvement. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229859 91177308-0d34-0410-b5e6-96231b3b80d8