[PATCH] [AArch64] Add patterns to match normal shift nodes: shl, sra, srl

[Hao Liu]

Hi t.p.northover,

Hi Tim and reviewers,

This patch fixes the problem that we can't select shl/sra/srl nodes. Match shl to USHL instructions. Match sra/srl to NEG and SSHL/USHL instructions (negative shift amounts for SSHL/USHL means right shfit). This solution is the same as ARM backend.

Code review. Please.

Thanks,
-Hao

http://llvm-reviews.chandlerc.com/D2439

Files:
  lib/Target/AArch64/AArch64InstrNEON.td
  test/CodeGen/AArch64/neon-shl-ashr-lshr.ll
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