[PATCH] LinkerScript: Add -T <scriptfile> option

[Meador Inge]

Update to fix the `-lfilename` bug mentioned earlier in the review and add more tests.  Note that input, `-l`, and `-T` still share the same code path in the option switch, *but* the correct checking is in place (and was before) to determine when we have a linker script in the case of input and `-l`.


http://reviews.llvm.org/D8138

Files:
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/GnuLdOptions.td
  lib/Driver/TODO.rst
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  test/elf/linkerscript/Inputs/valid.ls
  test/elf/linkerscript/invalid-script-cli-1.test
  test/elf/linkerscript/invalid-script-cli-2.test
  test/elf/linkerscript/valid-script-cli.objtxt

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