[PATCH] [lld][ELF] Ability to resolve undefined symbols lazily

[Denis Protivensky]

Hi ruiu, shankar.easwaran, Bigcheese,

Some symbols like _GLOBAL_OFFSET_TABLE_ may occur in linked object files when not usually expected (for example, glibc uses them for STT_GNU_IFUNC optimization). The patch lets writers override specific method and handle such kind of lazy resolution if needed.
Added implementation of handling _GLOBAL_OFFSET_TABLE_ symbol for ARM platform.

http://reviews.llvm.org/D8159

Files:
  include/lld/Core/LinkingContext.h
  include/lld/Core/Simple.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  include/lld/ReaderWriter/MachOLinkingContext.h
  lib/Driver/Driver.cpp
  lib/ReaderWriter/ELF/ARM/ARMExecutableWriter.h
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  lib/ReaderWriter/ELF/OutputELFWriter.h
  lib/ReaderWriter/MachO/MachOLinkingContext.cpp
  lib/ReaderWriter/PECOFF/LinkerGeneratedSymbolFile.h
  test/elf/ARM/got-symbol.test
  test/elf/ARM/missing-symbol.test

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