[PATCH] [AArch64] Select lower sub, abs pattern to sabd on AArch64

[Karthik Bhat]

Hi Jyoti,
Updated the test cases as per reveiw comments to checke the exact instruction being generated.
Merged test case with http://reviews.llvm.org/D6791.
Please let me know if you have any other comments or if it is good to commit.
Thanks and Regards
Karthik Bhat


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6781

Files:
  lib/Target/AArch64/AArch64InstrInfo.td
  test/CodeGen/AArch64/arm64-neon-simd-vabs.ll

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