[PATCH] Add a fallback mechanism for undefined atom.

[Rui Ueyama]

  - Add undef-fallback to the Native and YAML file formats.

Hi shankarke, kledzik, Bigcheese,

http://llvm-reviews.chandlerc.com/D1550

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1550?vs=3904&id=4218#toc

Files:
  include/lld/Core/SymbolTable.h
  include/lld/Core/UndefinedAtom.h
  lib/Core/Resolver.cpp
  lib/Core/SymbolTable.cpp
  lib/ReaderWriter/Native/NativeFileFormat.h
  lib/ReaderWriter/Native/ReaderNative.cpp
  lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
  test/core/undef-fallback.objtxt
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