[PATCH] ARM: replace branches to undefined weak functions with NOP

[Leny Kholodov]

1. Rebase with master.
2. Update code according to the comments from reviewers.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8807

Files:
  lib/ReaderWriter/ELF/ARM/ARMRelocationHandler.cpp
  test/elf/ARM/weak-branch.test

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