RFR: 8303968: Serial: Use more precise liveness info in Young GC reference processing [v2]

[Thomas Schatzl]

On Sun, 26 Mar 2023 17:53:22 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple refactoring around Young-GC keep-alive-closure.
>> 
>> (I went for the static-local-var approach, as other solutions that I am aware of would expose the is-alive-closure in the header.)
>> 
>> Test: tier1-3
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
> 
>  - review
>  - s1-ref-is-alive

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/12975#pullrequestreview-1358575836