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46c5a97adc
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