RFR(S): 8201367: assert(current != first_mem) failed: corrupted memory graph in superword code

[Roland Westrelin]

Hi Vladimir,

Thanks for looking at this.

> The logic looks fine to me. But is it optimal? Can we use 
> dependence_graph constructed before this code?

I looked at the dependence graph but couldn't find a way it would help.

What about this instead?

http://cr.openjdk.java.net/~roland/8201367/webrev.01/

Roland.