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

[Albert Mingkun Yang]

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

Thanks for the review.

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