RFR(XS): 8245714: "Bad graph detected in build_loop_late" when loads are pinned on loop limit check uncommon branch

[Roland Westrelin]

Hi Vladimir,

> Looks good to me too.

Thanks for the review but I pushed this already as Tobias said it was
trivial.

> I would suggest to use explicit check if you want to test when C2 is enabled:
>
> @requires vm.compiler2.enabled

Tobias made that suggestion too and I included it.

Roland.