RFR (XS): Wrong volatile qualifier for field ClassLoaderDataGraphKlassIteratorAtomic::_next_klass

[Siebenborn, Axel]

Hi,
can I have some reviews for this small change.
It fixes a serious problem as the pointer _next_klass is changed concurrently but not correctly declared as volatile.
The change fixes the declaration and removes an unneeded cast.

bug: https://bugs.openjdk.java.net/browse/JDK-8074561

webrev: http://cr.openjdk.java.net/~asiebenborn/8074561/webrev.00/

I need a sponsor for the change.

Thanks,
Axel
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