RFR: 8224167: Refactor PtrQueue completed buffer processing

[Aleksey Shipilev]

On 5/20/19 11:15 PM, Kim Barrett wrote:
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8224167/open.00/

Shenandoah parts look good. They do not seem to affect performance in adverse way.

Let me understand: SATBMarkQueue::handle_completed_buffer does reply either empty buffer (after full
filtering/enqueueing), or semi-full buffer if filters were applied and it still decided not to
enqueue it.

-Aleksey

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