Add definition of DSBH (Double Swap Bytes within Halfwords) and
DSHD (Double Swap Halfwords within Doublewords). Add a pattern which replaces 64-bit bswap with a DSBH and DSHD pair. llvm-svn: 147017
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DSHD (Double Swap Halfwords within Doublewords). Add a pattern which replaces 64-bit bswap with a DSBH and DSHD pair. llvm-svn: 147017