RFR: 8198530: Move _gc_policy_counters from GenCollectorPolicy to GenCollectedHeap

[Stefan Karlsson]

Hi all,

Please review this patch to move _gc_policy_counters from 
GenCollectorPolicy to GenCollectedHeap.

  http://cr.openjdk.java.net/~stefank/8198530/webrev.01/
  https://bugs.openjdk.java.net/browse/JDK-8198530

This is a step towards the removal of CollectorPolicy:

  https://bugs.openjdk.java.net/browse/JDK-8198505

Thanks,
StefanK