RFR: 8375630: G1: Convert G1ConcurrentMark to use Atomic<T>

[Aleksey Shipilev]

On Mon, 19 Jan 2026 13:25:48 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change to `G1ConcurrentMark` to use `Atomic<T>`.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29300#pullrequestreview-3681353001