Fwd: [PATCH] Reorder shuffle and binary operation.

[Serge Pavlov]

Hi all,

Strange but I don't see message from Phabricator, so forward it manually.
Could you please review the fix?

Thanks,
--Serge

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This patch allows simplification:

    BinOp(shuffle(v1), shuffle(v2)) -> shuffle(BinOp(v1, v2))

if both shuffles use the same mask, and both shuffle within a single vector.

http://reviews.llvm.org/D3525

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  lib/Transforms/InstCombine/InstCombineShifts.cpp
  lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/vec_shuffle.ll
  test/Transforms/LoopVectorize/store-shuffle-bug.ll
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