[PATCH] [LayoutPass] Add a method to check the followon graph structure.

[Rui Ueyama]

  - Added a test
  - Handle in-group reference

Hi shankarke,

http://llvm-reviews.chandlerc.com/D922

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D922?vs=2283&id=2284#toc

Files:
  include/lld/Core/Atom.h
  include/lld/Passes/LayoutPass.h
  lib/Passes/LayoutPass.cpp
  lib/ReaderWriter/ELF/Atoms.h
  test/layout-error-test.objtxt
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