RFR: 8368842: Parallel: Refactor PCAddThreadRootsMarkingTaskClosure

[Francesco Andreuzzi]

On Mon, 29 Sep 2025 07:43:07 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial revising the signature of `PCAddThreadRootsMarkingTaskClosure` to pass `ParCompactionManager*` instead of `uint worker_id` as the constructor arg.
> 
> Test: tier1

Marked as reviewed by fandreuzzi (Author).

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PR Review: https://git.openjdk.org/jdk/pull/27541#pullrequestreview-3278443503