[PATCH] Implement ADRP CSE for global symbols

[Jiangning Liu]

Hi qcolombet, t.p.northover,

This patch depends on another patch "Enable global merge pass." at http://reviews.llvm.org/D3431.

This patch is to implement ADRP CSE for global symbols defined within the module being compiled.

http://reviews.llvm.org/D3432

Files:
  include/llvm/IR/GlobalAlias.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/IR/Globals.cpp
  lib/Transforms/Scalar/GlobalMerge.cpp
  test/CodeGen/AArch64/global_merge_2.ll
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