[PATCH] Make DAGCombiner work on vector bitshifts with constant splat vectors.

[Matt Arsenault]

http://llvm-reviews.chandlerc.com/D2997

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/neon-shl-ashr-lshr.ll
  test/CodeGen/X86/avx2-vector-shifts.ll
  test/CodeGen/X86/sse2-vector-shifts.ll
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