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

[Roland Westrelin]

> Why did webrev.00 work then?

I modified 2 tests if can_alias(). As you pointed, once change was
pointless but the other was the actual fix.

> I've noticed that you've removed the command lines from the test. No need anymore to run with
> /othervm then. And you can remove the whitespace before the comment in compile.cpp:1907 (no new
> webrev required) :)

Actually, I need -XX:-BackgroundCompilation.

Roland.