RFR(S): 8236759: ShouldNotReachHere in PhaseIdealLoop::verify_strip_mined_scheduling

[Roland Westrelin]

Thanks for reviewing this, Tobias.

> Just wondering why you need the checks in line 1487? Isn't in->is_OuterStripMinedLoop() sufficient
> since we should never schedule a data node in the outer strip mined loop?

It could be top too. Also I guess, I'm becoming paranoid about little
things going wrong with strip mining...

Roland.