RFR: 8376115: G1: Convert G1CMRootRegions to use Atomic<T> [v2]

[Kim Barrett]

On Mon, 26 Jan 2026 09:45:46 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this change to convert `G1CMRootRegions` to use `Atomic<T>`.
>> 
>> Testing: gha
>> 
>> Thanks,
>>   Thomas
>
> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   * kbarrett review

Still good.

-------------

Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29363#pullrequestreview-3734061605