[PATCH] [Polly][Refactor] Change the comment style to silence -Wcomment

[Johannes Doerfert]

Hi grosser,

  -Wcomment complained about a "multi-line comment" caused by the
   ascii art used in ScopHelper to describe the CFG.

http://reviews.llvm.org/D5618

Files:
  lib/Support/ScopHelper.cpp
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