[PATCH] 'CSE' of ADRP instructions used for load/store addressing

[Jiangning Liu]

  Rebase the patch on TOT, because the last patch will raise build time failure on TOT.

Hi t.p.northover,

http://reviews.llvm.org/D3223

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3223?vs=8221&id=8624#toc

Files:
  include/llvm/IR/GlobalAlias.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/IR/Globals.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Transforms/Scalar/GlobalMerge.cpp
  test/CodeGen/AArch64/global_merge.ll
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