RFR: 8367848: Parallel: Use NMethodToOopClosure during Young GC [v3]

[Thomas Schatzl]

On Thu, 18 Sep 2025 09:04:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Replace `MarkingNMethodClosure` with `NMethodToOopClosure` during young-gc. After that, a new local `ThreadsClaimTokenScope` is introduced instead of `StrongRootsScope` to make the thread-claim-token logic visible in the current context.
>>  
>> Test: tier1-3
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27336#pullrequestreview-3243540019