[PATCH] Implement ADRP CSE for global symbols

[Jiangning Liu]

This patch make some more little changes,
1) Remove file mode change
2) Remove useless comments

Thanks,
-Jiangning

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
  lib/Transforms/Scalar/Scalar.cpp
  test/CodeGen/AArch64/global-merge.ll
  test/CodeGen/AArch64/global_merge_1.ll
  test/CodeGen/ARM/global-merge-1.ll
  test/CodeGen/ARM64/global-merge.ll
  test/Transforms/GlobalMerge/AArch64/global-merge-1.ll
  test/Transforms/GlobalMerge/AArch64/global-merge-2.ll
  test/Transforms/GlobalMerge/AArch64/lit.local.cfg
  test/Transforms/GlobalMerge/ARM/arm.ll
  test/Transforms/GlobalMerge/ARM64/arm64.ll
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