RFR: 8374687: ZGC: Convert zNMethodTableIteration to use Atomic<T>

[Stefan Karlsson]

On Fri, 16 Jan 2026 08:46:12 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Convert usages of AtomicAccess to Atomic<T> in zNMethodTableIteration.
> 
> Testing:
>  * GHA
>  * HotSpot GC tests with ZGC linux x64 and linux aarch64

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29267#pullrequestreview-3669705252