[PATCH] lld] handle the case of errors from createLinkerInput

[Shankar Kalpathi Easwaran]

Hi kledzik, Bigcheese,

This changes the interface of createLinkerInput to use ErrorOr, so that errors from the linker can be captured.
    
Also adds a convenience function for error strings to be returned from file nodes.


http://llvm-reviews.chandlerc.com/D1571

Files:
  include/lld/Driver/CoreInputGraph.h
  include/lld/Driver/DarwinInputGraph.h
  include/lld/Driver/GnuLDInputGraph.h
  include/lld/Driver/InputGraph.h
  include/lld/Driver/WinLinkInputGraph.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  lib/Driver/CoreDriver.cpp
  lib/Driver/DarwinLdDriver.cpp
  lib/Driver/Driver.cpp
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/WinLinkDriver.cpp
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  test/elf/librarynotfound.test
  unittests/DriverTests/DriverTest.h
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