[PATCH] [AArch64] Implement getMaximumUnrollFactor()

[Z. Zheng]

  No code change. Added test case for ARM64 backend.

Hi Jiangning, t.p.northover, hfinkel, apazos,

http://reviews.llvm.org/D3320

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3320?vs=8617&id=8627#toc

Files:
  lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll
  test/Transforms/LoopVectorize/ARM64/arm64-unroll.ll
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