[PATCH] [lld] add InputGraph to process Command line arguments

[Shankar Kalpathi Easwaran]

  As me/Bigcheese discussed on IRC, these are the changes planned in the revised patch.

  The name of the class remains as InputGraph, as we dont plan on flattening it to a list, and the data structure resembles a tree.
  InputGraph would have functionality to just add Input Nodes and will not know anything about llvm::opt
  Move OptionInfo to the driver, OptionInfo would create nodes for the InputGraph
  The InputElement will have an additional function to create a LinkerInput from it, for lld to use

  Still to be added :-

  a) Add tests
  b) Add functionality to dump
  c) Changes to be done in other flavors too

Hi Bigcheese, kledzik, ruiu,

http://llvm-reviews.chandlerc.com/D1217

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1217?vs=3001&id=3058#toc

Files:
  include/lld/Core/File.h
  include/lld/Core/TargetInfo.h
  include/lld/Driver/Driver.h
  include/lld/Driver/GnuLDInputGraph.h
  include/lld/Driver/InputGraph.h
  include/lld/Driver/LinkerInput.h
  lib/Driver/CMakeLists.txt
  lib/Driver/CoreDriver.cpp
  lib/Driver/DarwinLdDriver.cpp
  lib/Driver/Driver.cpp
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/InputGraph.cpp
  lib/Driver/LDOptions.td
  lib/Driver/WinLinkDriver.cpp
  lib/ReaderWriter/ELF/ELFTargetInfo.cpp
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