[PATCH] [AArch64] Build correct vector filled with undef nodes

[Xu Jiangwei]

Actually, getConstant has been provided to build a BuildVector Node.

Please have a look.
David

http://reviews.llvm.org/D5139

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/aarch64_tree_tests.ll
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