RFR: 8209396: Make PtrQueueSets not statically allocated

[Thomas Schatzl]

Hi Kim,

On Sun, 2018-08-12 at 18:07 -0400, Kim Barrett wrote:
> Please review this change to G1BarrierSet to make its two PtrQueueSet
> members (_satb_mark_queue_set and _dirty_card_queue_set) be ordinary
> data members rather than static data members.
> [...]
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8209396
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8209396/open.00/
> 

  looks good.

Please consider moving the return statement at g1BarrierSet.cpp:66 to a
new line and add braces.

Thanks,
  Thomas