[PATCH] LinkerScript: Add parsing of the EXTERN command

[Meador Inge]

This patch implements parsing of the GNU ld EXTERN command [1].
Evaluation will be added at a later point in time.

[1] https://sourceware.org/binutils/docs-2.25/ld/Miscellaneous-Commands.html#Miscellaneous-Commands

http://reviews.llvm.org/D8271

Files:
  include/lld/ReaderWriter/LinkerScript.h
  lib/ReaderWriter/LinkerScript.cpp
  test/LinkerScript/extern-bad-symbol.test
  test/LinkerScript/extern-empty.test
  test/LinkerScript/extern-valid.test

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