[PATCH] [Driver] Add -L and -l support.

[Michael Spencer]

  Make the Driver responsible for doing path look up, but still forward the search paths to -core because loaded object files may have additional library look ups.

  This also renames the -core option to -input-search-path=.

Hi shankarke, kledzik,

http://llvm-reviews.chandlerc.com/D365

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D365?vs=872&id=894#toc

Files:
  include/lld/Core/LinkerOptions.h
  lib/Driver/CoreOptions.td
  lib/Driver/Drivers.cpp
  lib/Driver/LDOptions.td
  test/Driver/lib-search.test
  test/elf/Inputs/libfnarchive.a
  test/elf/Inputs/libfnarchive.x86_64
  test/elf/archive-elf-forceload.objtxt
  test/elf/archive-elf.objtxt
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