[PATCH] [DAGCombiner] Remove extra bitcasts surrounding vector shuffles

[Simon Pilgrim]

Thanks Quentin,

I've added an extra test for peeking through the bitcasted masked constant vectors. The UNDEF implementation was never getting hit so I dropped that for simplicity (visitVECTOR_SHUFFLE has support for cases where the second operand is UNDEF already).


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9097

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/combine-or.ll

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