RFR: 8375439: G1: Convert G1MonotonicArena class to use Atomic<T>

[Ivan Walulya]

On Fri, 16 Jan 2026 11:06:03 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review the change to use `Atomic<T>` in `G1MonotonicArena`.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29277#pullrequestreview-3676966367