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

[Kevin Qin]

This patch is to enable partial unrolling and runtime unrolling for AArch64 target. Applying this patch with the runtime unrolling prologue changes I just sent together, the SPEC2000 got improved by 0.6%, and for SPEC2006, the improved number is 0.8%. For code size, the images of two benchmarks got same 20% inflation. This experiment is done on A57. 


Thanks,
Kevin

http://reviews.llvm.org/D5148

Files:
  lib/Target/AArch64/AArch64TargetTransformInfo.cpp
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