[PATCH] [DAGCombiner] Combine shuffles of BUILD_VECTOR and SCALAR_TO_VECTOR

[Simon Pilgrim]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8516

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/AArch64/arm64-neon-copy.ll
  llvm/trunk/test/CodeGen/AArch64/arm64-vshuffle.ll
  llvm/trunk/test/CodeGen/PowerPC/vperm-lowering.ll
  llvm/trunk/test/CodeGen/X86/mmx-bitcast.ll
  llvm/trunk/test/CodeGen/X86/sse41.ll
  llvm/trunk/test/CodeGen/X86/vec_insert-5.ll
  llvm/trunk/test/CodeGen/X86/vec_insert-mmx.ll
  llvm/trunk/test/CodeGen/X86/vec_zero_cse.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v16.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v8.ll

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