RFR: 8375622: G1: Convert G1CodeRootSet to use Atomic<T> [v2]

[Thomas Schatzl]

On Wed, 21 Jan 2026 08:44:28 GMT, Stefan Johansson <sjohanss 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 sjohanss (Reviewer).

Thanks @kstefanj @shipilev for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/29296#issuecomment-3776932032