[Polly][PATCH] Use reference to clarify pointer can never be null

[Johannes Doerfert]

> -const ScopDetection::BoxedLoopsSetTy *
> +const ScopDetection::BoxedLoopsSetTy &
>  ScopDetection::getBoxedLoops(const Region *R) const {
> -  auto BLMIt = BoxedLoopsMap.find(R);
> -  if (BLMIt == BoxedLoopsMap.end())
> -    return nullptr;
> -  return &BLMIt->second;
> +  return BoxedLoopsMap.find(R)->second;
>  }
Are you sure the access of ->second is actually legal if find returns
BoxedLoopsMap.end() ?
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