[PATCH] [Target/AArch64] Introduce OptimizeBarriersPass

[Davide Italiano]

Hi rengolin, t.p.northover,

This is largely modeled after the OptimizeBarriers ARM pass. I hope it sounds reasonable to you two.
Tim, Renato, I noticed this is on also with -O0 on ARM as well, maybe we should disable this if optimization-level == 0? (it can be done in a subsequent commit)

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9632

Files:
  lib/Target/AArch64/AArch64.h
  lib/Target/AArch64/AArch64OptimizeBarriersPass.cpp
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Target/AArch64/CMakeLists.txt
  test/CodeGen/AArch64/optimize-dmbs.ll

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