[PATCH] [X86][SSE] pslldq/psrldq byte shifts/rotation for SSE2

[Simon Pilgrim]

rebased against trunk

http://reviews.llvm.org/D5699

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/palignr.ll
  test/CodeGen/X86/sse3.ll
  test/CodeGen/X86/vec_insert-5.ll
  test/CodeGen/X86/vector-shuffle-128-v16.ll
  test/CodeGen/X86/vector-shuffle-128-v8.ll
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