[PATCH] [AArch64 NEON] Try to generate CONCAT_VECTOR when lowering BUILD_VECTOR or SHUFFLE_VECTOR.

[Kevin Qin]

  Fixed a bug in isKnownShuffleVector() which may cause assertion problem. Please review.

http://llvm-reviews.chandlerc.com/D2542

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2542?vs=6428&id=6454#toc

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  test/CodeGen/AArch64/neon-copy.ll
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