RFR: 8371956: Convert OopStorage to use Atomic<T> [v2]

[Thomas Schatzl]

On Mon, 17 Nov 2025 20:17:22 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Please review this change to OopStorage to use Atomic<T> rather than directly
>> applying AtomicAccess to volatile members.
>> 
>> Testing: mach5 tier1-5
>
> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed unintentional load_acquire in test

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28338#pullrequestreview-3475965165