[PATCH] Add observers to Input Graph

[Rui Ueyama]

- Added a test

http://reviews.llvm.org/D3735

Files:
  include/lld/Core/ArchiveLibraryFile.h
  include/lld/Core/InputGraph.h
  lib/Core/InputGraph.cpp
  lib/ReaderWriter/FileArchive.cpp
  unittests/DriverTests/InputGraphTest.cpp
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