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

[Rui Ueyama]

Hi shankarke,

I found that having a method to check the strucutre of the followon graph makes
it easy to debug file readers. The method checks if there's no wrong edge in
followOnNexts and followOnRoots. It is called only when debuggging is enabled
for LayoutPass. Do you agree this new code worth to be added?

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

Files:
  include/lld/Core/Atom.h
  include/lld/Passes/LayoutPass.h
  lib/Passes/LayoutPass.cpp
  lib/ReaderWriter/ELF/Atoms.h
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