[PATCH] [AArch64] Make FP Load Balancing pass target agnostic, NFC

[Z. Zheng]

Hi apazos, mcrosier, t.p.northover,

This pass does hurt Cortex-A53 and previous patch: http://reviews.llvm.org/D6008 turns it on by default.

Making it target agnostic, NFC.

http://reviews.llvm.org/D6009

Files:
  lib/Target/AArch64/AArch64.h
  lib/Target/AArch64/AArch64A57FPLoadBalancing.cpp
  lib/Target/AArch64/AArch64FPLoadBalancing.cpp
  lib/Target/AArch64/AArch64PBQPRegAlloc.cpp
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Target/AArch64/CMakeLists.txt
  test/CodeGen/AArch64/aarch64-a57-fp-load-balancing.ll
  test/CodeGen/AArch64/aarch64-fp-load-balancing.ll
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