[PATCH] [AArch64] Enable post-RA MI scheduler

[Sanjin Sijaric]

Hi mcrosier, Jiangning, jmolloy, t.p.northover,

We saw improvements in spec2000/mesa (5%) and spec2000/crafty (3%) on cortex-a53 when compiled with -Ofast -mcpu=cortex-a53.  The patch enables the post-RA MI scheduler for both cortex-a53 and cortex-a57, but I haven't done runs on cortex-a57.  If compile time is an issue, perhaps we can enable this only for the in-order architectures (e.g. cortex-a53).  

Thanks,
Sanjin

http://reviews.llvm.org/D5278

Files:
  lib/Target/AArch64/AArch64Subtarget.h
  lib/Target/AArch64/AArch64TargetMachine.cpp
  test/CodeGen/AArch64/arm64-postra-mi-sched.ll
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