[PATCH] [PECOFF] Support COMDAT associative sections.

[Rui Ueyama]

It turned out that dumping associate() contents to Native format
is too much, because it's not easy to dump variable length objects
to Native format. We would have had to define a new chunk for
associated atoms.

So I came back to the original design to use References to represent
"associate" relationships. I believe I found a way to implement it
in an efficient way. PTAL.

http://reviews.llvm.org/D4028

Files:
  include/lld/Core/Reference.h
  include/lld/Core/Resolver.h
  lib/Core/Resolver.cpp
  lib/ReaderWriter/PECOFF/Atoms.h
  lib/ReaderWriter/PECOFF/ReaderCOFF.cpp
  lib/ReaderWriter/Reader.cpp
  test/core/associates.objtxt
  test/pecoff/Inputs/associative1.obj.yaml
  test/pecoff/Inputs/associative3.obj.yaml
  test/pecoff/associative.test
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