[PATCH] Canonicalize splats as build_vectors (PR22283)

[Sanjay Patel]

Thanks, Andrea. Minor update to use local VT var; patch rebased against r228149.


http://reviews.llvm.org/D7389

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/ARM/vdup.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll

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