RFR: 8374984: Convert workerUtils to use Atomic<T> [v2]

[Stefan Karlsson]

On Wed, 14 Jan 2026 22:45:19 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Please review this change to make SubTasksDone and SequentialSubTasksDone use
>> Atomic<T> instead of AtomicAccess.
>> 
>> Testing: mach5 tier1
>
> Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'master' into worker-utils-atomic
>  - use compare_set
>  - worker utils

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29201#pullrequestreview-3664620449