[PATCH] [TargetInfo] Move LinkerInputFile to TargetInfo and rename more specific name

[Rui Ueyama]

  Then, I think my suggestion is to let TargetInfo to handle -u as this patch does, and create another target-specific linker internal file for ELF in ReaderWriter/ELF/. For ELF two pseudo linker internal files would be added (one by TargetInfo for -u and the other is by ELFTargetInfo).

http://llvm-reviews.chandlerc.com/D1016