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

[Thomas Schatzl]

On Sun, 1 Feb 2026 00:23:36 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   * kbarrett review
>
> Still good.

Thanks @kimbarrett @walulyai for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/29363#issuecomment-3834103665