[PATCH] Add observers to Input Graph

[Rui Ueyama]

Closed by commit rL208753 (authored by @ruiu).

http://reviews.llvm.org/D3735

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