[PATCH] [Polly][Refactor][NFC] Allow to nicely bail from ScopInfo.

[Johannes Doerfert]

Hi grosser, sebpop, dpeixott, simbuerg, zinob,

  Each SCoP statement has a flag to indicate if the construction was
  successful and if one statement couldn't be constructed the SCoP
  is invalidated and removed.

http://reviews.llvm.org/D6068

Files:
  include/polly/ScopInfo.h
  lib/Analysis/ScopInfo.cpp
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