RFR(M): 8216135: C2 assert(!had_error) failed: bad dominance

[Roland Westrelin]

> Looks reasonable.

Thanks for the review.

> Did you test with switched off UseLoopPredicate?

I didn't and sure, that makes sense. I'll run that on my system
tonight. Or maybe Tobias can run the same testing he ran with
UseLoopPredicate off?

Roland.