[PATCH] [AArch64] Improve and enable the SeparateConstOffsetFromGEP for AArch64 backend.

[Hao Liu]

Add a new patch refactored according to Jingyue's comments.
Review please.

Thanks,
-Hao

http://reviews.llvm.org/D5864

Files:
  include/llvm/Transforms/Scalar.h
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
  test/CodeGen/AArch64/aarch64-gep-opt.ll
  test/CodeGen/AArch64/arm64-addr-mode-folding.ll
  test/CodeGen/AArch64/arm64-cse.ll
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