RFR(S): 8238384: CTW: C2 compilation fails with "assert(store != load->find_exact_control(load->in(0))) failed: dependence cycle found"

[Roland Westrelin]

>> Actually, I need -XX:-BackgroundCompilation.
>
> Okay, don't forget to add it to the change before the push then (the
> webrev does not have it).

Right. Thanks. Anyone else for a review?

Roland.