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shuffle lowering to allow much better blend matching. Specifically, with the new structure the code seems clearer to me and we correctly can hit the cases where merging two 128-bit lanes is a clear win and can be shuffled cheaply afterward. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222539 91177308-0d34-0410-b5e6-96231b3b80d8