RFR (S): JDK-8065992: Change CMSCollector::_young_gen to be a ParNewGeneration*

[Bengt Rutisson]

Hi everyone,

Could I have a couple of reviews for this simple change?

http://cr.openjdk.java.net/~brutisso/8065992/webrev.00/

https://bugs.openjdk.java.net/browse/JDK-8065992

Now that CMS is always using ParNew we can use a more specific type for 
the instance variable to hold the young gen pointer. This avoids some 
explicit casting.

Thanks,
Bengt