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

[Thomas Schatzl]

On Mon, 19 Jan 2026 08:53:00 GMT, Ivan Walulya <iwalulya 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).

Thanks @walulyai @stefank for your review

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PR Comment: https://git.openjdk.org/jdk/pull/29277#issuecomment-3767199796