[PATCH] R600/SI: Add pattern for bswap

[Matt Arsenault]

Inspired by https://github.com/clyfish/gcn-scrypt/blob/master/endian_swap.isa

http://reviews.llvm.org/D5512

Files:
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIISelLowering.h
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/bswap.ll
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