[9] RFR(S): 8179678: ArrayCopy with same src and dst can cause incorrect execution or compiler crash

[Roland Westrelin]

Thanks for the review, Vladimir.

> Roland, can you move detect_ptr_independence() after instance_id()
> check? detect_ptr_independence() calls all_controls_dominate() which
> is expensive.

Right.

I found another bug with this. Another webrev is coming.

Roland.