[PATCH] [ELF] Add --{,no-}as-needed.

[Rui Ueyama]

Hi atanasyan, Bigcheese, shankarke,

The previous default behavior of LLD was --as-needed. LLD linked
against a DSO only if the DSO file was actually used to link an
executable (i.e. at least one symbol was resolved using the shared
library file.) What was missing was --no-as-needed support.

In this patch I added a boolean flag to FileNode for --as-needed.
I also added an accessor to DSO name to shared library file class.

http://reviews.llvm.org/D7009

Files:
  include/lld/Core/Node.h
  include/lld/Core/SharedLibraryFile.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/TODO.rst
  lib/ReaderWriter/ELF/DynamicFile.h
  lib/ReaderWriter/ELF/OutputELFWriter.h
  lib/ReaderWriter/MachO/File.h
  test/elf/Mips/dynsym-table-1.test
  test/elf/as-needed.test

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