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

[Shankar Kalpathi Easwaran]

  This change adds functionality to process arguments into a Graph form.

  This also cleans up a lot of code, to process arguments in a simpler way.

  Passes all the tests and adds an additional test.

  More TODO after committing this change would be :-

  a) Add dumping changes for Gnu LD
  b) Add validation checks for Gnu LD

Hi Bigcheese, kledzik, ruiu,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1217?vs=3058&id=3392#toc

Files:
  include/lld/Core/File.h
  include/lld/Core/LinkingContext.h
  include/lld/Driver/CoreInputGraph.h
  include/lld/Driver/DarwinInputGraph.h
  include/lld/Driver/Driver.h
  include/lld/Driver/GnuLDInputGraph.h
  include/lld/Driver/InputGraph.h
  include/lld/Driver/LinkerInput.h
  include/lld/Driver/OptionInfo.h
  include/lld/Driver/WinLinkInputGraph.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  include/lld/ReaderWriter/MachOFormat.hpp
  include/lld/ReaderWriter/PECOFFLinkingContext.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/ELFLinkingContext.cpp
  lib/ReaderWriter/MachO/MachOFormat.hpp
  lib/ReaderWriter/MachO/MachOLinkingContext.cpp
  lib/ReaderWriter/MachO/WriterMachO.cpp
  lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp
  lib/ReaderWriter/ReaderLinkerScript.cpp
  test/Driver/libsearch-inputGraph.test
  test/elf/X86_64/nmagic.test
  test/elf/X86_64/omagic.test
  test/elf/archive-elf-forceload.objtxt
  unittests/DriverTests/DarwinLdDriverTest.cpp
  unittests/DriverTests/DriverTest.h
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