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

[Matt Arsenault]

  Add part that adds getScalarTypeSizeInBits()

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2997?vs=7618&id=7645#toc

Files:
  include/llvm/CodeGen/SelectionDAGNodes.h
  include/llvm/CodeGen/ValueTypes.h
  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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