[PATCH] Move LinkerInput to LinkingContext.

[Shankar Kalpathi Easwaran]

  When you try to parse the directive section, you are calling the Driver to parse and set various options, isnt it ?
  I think you could add to the list of inputs at the time when you are called then right ?

  The problem with handling it outside the driver is you have to create the actual input file, It might be a library or .obj, without an extension and so forth. The InputGraph nodes already deal with that kind of complexity.

  I am not certain on this is the way, we want to do this change though.

http://llvm-reviews.chandlerc.com/D1569