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

[Michael Spencer]

Hi shankarke, kledzik,

This patch adds support for -L and -l to the ld driver. It also implements
library lookup for .a files.

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

Files:
  include/lld/Core/LinkerOptions.h
  include/lld/Core/TargetInfo.h
  lib/Core/TargetInfo.cpp
  lib/Driver/CoreOptions.td
  lib/Driver/Drivers.cpp
  lib/Driver/LDOptions.td
  lib/Driver/LinkerInvocation.cpp
  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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