[PATCH] SelectionDAG: Handle out-of-bounds index in extract vector element

[Paweł Bylica]

This patch correctly handles undef case of EXTRACT_VECTOR_ELT node where the element index is constant and not less than vector size.

http://reviews.llvm.org/D9250

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/X86/extract-store.ll
  test/CodeGen/X86/extractelement-index.ll

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