RFR: 8375535: G1: Convert CardTableBarrierSet and subclasses to use Atomic<T>

[Kim Barrett]

On Thu, 22 Jan 2026 12:58:39 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   use `Atomic<T>` instead of `AtomicAccess` in `CardTableBarrierSet` and subclasses. Since this modifies `CardTableBarrierSet::_card_table` the change has some fan-out.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29360#pullrequestreview-3699068875