[PATCH] [lld][ELF] Add undefined symbol option to lld

[Shankar Kalpathi Easwaran]

Hi Bigcheese,

This adds -u/--undefined option to lld ELF.

http://llvm-reviews.chandlerc.com/D997

Files:
  include/lld/ReaderWriter/ELFTargetInfo.h
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/LDOptions.td
  lib/ReaderWriter/ELF/DynamicLibraryWriter.h
  lib/ReaderWriter/ELF/ExecutableWriter.h
  lib/ReaderWriter/ELF/OutputELFWriter.h
  test/elf/X86_64/Inputs/libfn.a
  test/elf/X86_64/undef.test
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