[PATCH] [PECOFF] Add a pass to ensure the correct ordering of grouped sections.

[Rui Ueyama]

  Seems DeadStrip is kicked off by Resolver::resolve() and then this pass is called. So if there's a section whose atoms are all dead, such atoms will be removed before this pass is called. That means that this pass won't make dead atoms alive.

  I think I don't understand about the mergeable atoms and this pass. Is there anything special about that?

http://llvm-reviews.chandlerc.com/D998