RFR: 8367240: Parallel: Refactor PSScavengeCLDClosure [v4]

[Albert Mingkun Yang]

On Tue, 9 Sep 2025 15:49:51 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Refactor `PSScavengeCLDClosure` and its "enclosing" `PSScavengeFromCLDClosure` so that all CLD logic is encapsulated in the CLD closure, without polluting the oop closure.
>> 
>> Test: tier1-3
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/27165#issuecomment-3274838621