RFR: 8366240: Improve memory ordering in new CPU Time Profiler [v4]

[SendaoYan]

On Tue, 14 Oct 2025 07:29:41 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> Remove acq-rel semantics where it isn't needed.
>
> Johannes Bechberger has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:
> 
>  - Merge branch 'master' of https://git.openjdk.org/jdk into parttimenerd_reduce_synchronization
>  - Merge branch 'master' into parttimenerd_reduce_synchronization
>  - Extend comment
>  - Remove unnecessary line
>  - Remove redundant synchronization

This PR seems cause a new test failure [JDK-8370647](https://bugs.openjdk.org/browse/JDK-8370647)

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PR Comment: https://git.openjdk.org/jdk/pull/26960#issuecomment-3445413790