RFR: 8374876: Epsilon: Convert to use Atomic<T>

[Stefan Karlsson]

On Mon, 12 Jan 2026 10:12:08 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Epsilon uses AtomicAccess on volatile data. Convert it to use Atomic<T>. 
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `gc/epsilon`, 100x

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29163#pullrequestreview-3650478548