[PATCH] [AArch64] Enable partial unrolling and runtime unrolling for AArch64 target

[Kevin Qin]

Hi,

After some performance investigation on smaller granular, I proposed to set 16 as loop buffer size for A57. I will post some experiments result in following comments. Thanks Chandler and Jiangning for their advices.

Cheers,
Kevin

http://reviews.llvm.org/D5148

Files:
  lib/Target/AArch64/AArch64SchedA57.td
  lib/Target/AArch64/AArch64TargetTransformInfo.cpp
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