[PATCH] Fix shuffle vector lowering for generating correct vext with reversed input vectors

[Jiangning Liu]

Hi t.p.northover,

This patch is to fix a bug around deciding if we need to reverse the two input vectors when trying to lower shuffle vector into a vext ISD node.

A new test file is added to enumerate all < 4 x i16> shufflevector masks containing two undefs.

Thanks,
-Jiangning

http://reviews.llvm.org/D3867

Files:
  lib/Target/ARM64/ARM64ISelLowering.cpp
  test/CodeGen/ARM64/vext_reverse.ll
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