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

[Roland Westrelin]

> I agree with your analysis but I'm confused by your changes to Compile::can_alias(). You are
> checking if the alias_idx belongs to a known instance address type but how can line 1909 then ever
> return false? Doesn't alias_idx == AliasIdxBot imply known_instance == false?

Right. What about the following webrev?

http://cr.openjdk.java.net/~roland/8238384/webrev.01/

Roland.