RFR: couple small strip mining fixes

[Roland Westrelin]

> The space styling is inconsistent though (that is to say the original style is bad, but we can at
> least match it):
>
>   if( !r->is_Region() ) return NULL;
>   if (r->is_Loop() && r->in(LoopNode::LoopBackControl)->is_top()) return NULL; // going away anyway
>   if( phi->region() != r ) return NULL;
>
> Should be:
>
>   if( !r->is_Region() ) return NULL;
>   if( r->is_Loop() && r->in(LoopNode::LoopBackControl)->is_top() ) return NULL; // going away anyway
>   if( phi->region() != r ) return NULL;

The usual practice in c2 code is to only use the new style and clean
things up around the code that is changed. This said, cleaning things up
will make merging from upstream trickier.

Anyway, that change is part of my loop strip mining patch that is being
reviewed upstream. If there's a need to fix the coding style, it will
happen upstream and we'll get it at some point. So I would leave the
patch as it is.

Roland.