[PATCH] [lld] ELF: Support detection of relocation errors during processing

[Will Newton]

1. Split out AArch64 ABS32 overflow checking code to a separate patch
2. Add a mutex to make sure error output it not interleaved when multi-threaded


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6827

Files:
  include/lld/Core/Error.h
  lib/Core/Error.cpp
  lib/ReaderWriter/ELF/AArch64/AArch64RelocationHandler.cpp
  lib/ReaderWriter/ELF/AArch64/AArch64RelocationHandler.h
  lib/ReaderWriter/ELF/AArch64/AArch64TargetHandler.cpp
  lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.cpp
  lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.h
  lib/ReaderWriter/ELF/Hexagon/HexagonTargetHandler.cpp
  lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.cpp
  lib/ReaderWriter/ELF/Mips/MipsRelocationHandler.h
  lib/ReaderWriter/ELF/Mips/MipsTargetHandler.cpp
  lib/ReaderWriter/ELF/PPC/PPCTargetHandler.cpp
  lib/ReaderWriter/ELF/PPC/PPCTargetHandler.h
  lib/ReaderWriter/ELF/SectionChunks.h
  lib/ReaderWriter/ELF/TargetHandler.h
  lib/ReaderWriter/ELF/X86/X86RelocationHandler.cpp
  lib/ReaderWriter/ELF/X86/X86RelocationHandler.h
  lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp
  lib/ReaderWriter/ELF/X86_64/X86_64RelocationHandler.cpp
  lib/ReaderWriter/ELF/X86_64/X86_64RelocationHandler.h
  lib/ReaderWriter/ELF/X86_64/X86_64TargetHandler.cpp

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