RFR: 8277916: Gather non-strong reference count logic in a single place

[Stefan Johansson]

On Mon, 29 Nov 2021 10:31:29 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Move the logic of tracking ref-count to `ReferenceProcessorPhaseTimes` so that the provider of getter/setter is consistent inside ref-processing.
> 
> Test: hotspot_gc

> > to remove ReferenceProcessorStats and instead pass in the "phase times" to report_gc_reference_stats
> 
> However, Shenandoah and ZGC don't use "phase times", so I don't see an easy way to satisfy all GCs after changing the signature of `report_gc_reference_stats`.

I was afraid something like this would stop this approach. Thanks.

Ship it!

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PR: https://git.openjdk.java.net/jdk/pull/6588