[PATCH] [PECOFF] Do not use layout-after/before relationships for grouped sections.

[Rui Ueyama]

Hi shankarke,

Adding layout edges to atoms for grouped sections turned to be too complicated
than it should be. This patch simplifies the code by adding user-supplied
comparator function to the layout pass object. TargetInfos are now able to
customize the layout pass behavior by passing custom comparator function.

http://llvm-reviews.chandlerc.com/D1292

Files:
  include/lld/Passes/LayoutPass.h
  lib/Passes/LayoutPass.cpp
  lib/ReaderWriter/PECOFF/GroupedSectionsPass.h
  lib/ReaderWriter/PECOFF/PECOFFTargetInfo.cpp
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