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

[Denis Protivensky]

Updated:

- removed const of StringRef
- added more symbols (__exidx_start/_end) with tests to show how it all works
- reworked the point of concern in DynamicSymbolFile::find() so it now uses unique_bump_ptr instead of llvm::Optional and the code is a bit cleaner
- fixed usage of findAbsoluteAtom iterators
- updated comments for LinkingContext::finalizeInputFiles


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/missing-symbol.test
  test/elf/ARM/undef-lazy-symbol.test

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