[PATCH] [AArch64] Add a run of reassociate after SeparateConstOffsetFromGEP

[James Molloy]

Hi Gerolf, t.p.northover,

For EarlyCSE to properly spot common integer adds, they must be properly associated.

Add test and update other tests for code permutation.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9148

Files:
  lib/Target/AArch64/AArch64TargetMachine.cpp
  test/CodeGen/AArch64/aarch64-gep-opt.ll
  test/CodeGen/AArch64/arm64-dagcombiner-load-slicing.ll
  test/CodeGen/AArch64/arm64-gep-reassoc.ll

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