RFR: 8368104: Parallel: Refactor PSThreadRootsTaskClosure [v3]

[Stefan Karlsson]

On Fri, 19 Sep 2025 20:49:39 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Trivial changing the closure input arg to avoid `PSPromotionManager` lookup.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27393#pullrequestreview-3252496441