RFR(XS): 8215044: C2 crash in loopTransform.cpp with assert(cl->trip_count() > 0) failed: peeling a fully unrolled loop

[Roland Westrelin]

Thanks for the review, Vladimir.

> BTW why we don't execute do_maximally_unroll() if trip count is known?

It's not a constant. It's at most 4, the maximum trip count.

Roland.