RFR: 8372251: Convert PartialArrayStepper/State to use Atomic<T>

[Thomas Schatzl]

On Mon, 24 Nov 2025 21:59:19 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to PartialArrayStepper and PartialArrayState to use
> Atomic rather than directly applying AtomicAccess to volatile members.
> 
> Testing: mach5 tier1-5

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28482#pullrequestreview-3503714307