RFR: 8374328: Convert simple AtomicAccess uses in gc/shared to use Atomic<T> [v3]

[Kim Barrett]

On Thu, 8 Jan 2026 07:28:28 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> 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 eight additional commits since the last revision:
>> 
>>  - Merge branch 'master' into simple-gc-shared-atomic
>>  - update copyrights
>>  - pretouch
>>  - WorkerThread control
>>  - SuspendibleThreadSet control
>>  - GCLocker control
>>  - ConcurrentGCThread termination protocol
>>  - DeoptimizeNMethodBarriersALot gating counter
>
> Marked as reviewed by dholmes (Reviewer).

Thanks for reviews @dholmes-ora and @tschatzl

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PR Comment: https://git.openjdk.org/jdk/pull/28987#issuecomment-3723360391