[PATCH] [InstCombine] Minor optimization for bswap with binary ops

[Simon Pilgrim]

Hi qcolombet, andreadb,

Added inst combine patterns for BSWAP with and/or/xor OP:

  OP( BSWAP(x), BSWAP(y) ) -> BSWAP( OP(x, y) )
  OP( BSWAP(x), CONSTANT ) -> BSWAP( OP(x, BSWAP(CONSTANT) ) )

Fixes PR15782

Since its just a one liner, I've also added BSWAP to the DAGCombiner equivalent as well:

  fold (OP (bswap x), (bswap y)) -> (bswap (OP x, y))

http://reviews.llvm.org/D6407

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  test/Transforms/InstCombine/bswap-fold.ll
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