RFR: 8375438: G1: Convert G1HeapRegion related classes to use Atomic<T> [v2]

[Thomas Schatzl]

On Mon, 2 Feb 2026 11:05:07 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   * shade review
>
> Marked as reviewed by shade (Reviewer).

Thanks @shipilev @walulyai for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/29301#issuecomment-3835773407