RFR: 8372565: Convert SATBMarkQueue to use Atomic<T>

[Kim Barrett]

On Thu, 27 Nov 2025 13:45:18 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Please review this change to SATBMarkQueue to use Atomic rather than directly
>> applying AtomicAccess to volatile members.
>> 
>> Testing: mach5 tier1-5
>
> Marked as reviewed by tschatzl (Reviewer).

Thanks for reviews @tschatzl , @shipilev , and @walulyai

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PR Comment: https://git.openjdk.org/jdk/pull/28525#issuecomment-3588420349