RFR: 8376335: Convert PreservedMarks classes to use Atomic<T> [v2]

[Thomas Schatzl]

On Wed, 28 Jan 2026 12:25:02 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - * improve docs
>>  - * stefank review
>
> Marked as reviewed by stefank (Reviewer).

Thanks @stefank @walulyai for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/29422#issuecomment-3816335803