RFR: 8375624: G1: Convert G1JavaThreadsListClaimer to use Atomic<T>

[Aleksey Shipilev]

On Mon, 19 Jan 2026 11:58:13 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change that makes `G1JavaThreadsListClaimer` use `Atomic<T>` instead of `AtomicAccess'.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29299#pullrequestreview-3681349930