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c0ea04389c
DSHD (Double Swap Halfwords within Doublewords). Add a pattern which replaces 64-bit bswap with a DSBH and DSHD pair. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147017 91177308-0d34-0410-b5e6-96231b3b80d8