[PATCH] [ELF] Implement parsing `-l` prefixed items in the `GROUP` linker script command

[Simon Atanasyan]

* Fixed all minor problems line `const` qualifiers, local variable naming etc.
* Made the code which handles a library name `-l` shorter and more similar to the code handles a regular file names.
* Keep using the `unknown` token to indicate an unexpected input. The same approach is used by other parts of the lexer now.
* Added some new test cases.
* I decided to do not introduce new routines like `canStartLibraryName` to validate library names. Anyway we check this name later and report an error if this name is invalid. It is better than reject a valid name here by mistake. By the way BFD and Gold linker accept almost arbitrary names.

http://reviews.llvm.org/D4469

Files:
  include/lld/ReaderWriter/LinkerScript.h
  lib/Driver/GnuLdInputGraph.cpp
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  lib/ReaderWriter/LinkerScript.cpp
  test/LinkerScript/libname-err-1.test
  test/LinkerScript/libname-err-2.test
  test/LinkerScript/linker-script.test
  test/elf/Inputs/group-cmd-search-3.ls
  test/elf/group-cmd-search.test
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