[PATCH] Implement ADRP CSE for global symbols

[Jiangning Liu]

  This patch is to fix the issue raised by Quentin and Tim. The code was cleaned, and the followings are changed
  1) Change IsInternalOnly to IsExternal, and add assertion.
  1) The behavior of -global-merge-on-external will not affect static variables any longer.
  2) Split a long if condition expression.

  Thanks,
  -Jiangning

Hi qcolombet, t.p.northover,

http://reviews.llvm.org/D3432

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3432?vs=8660&id=8710#toc

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_1.ll
  test/CodeGen/AArch64/global_merge_2.ll
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