RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v5]

[Johannes Bechberger]

On Sun, 25 May 2025 21:09:07 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Do we want to make hard assumptions on timer_t?
>
> You can have a field as a pointer: timer_t* timer and test it, timer != nullptr.

Wouldn't I need to store it somewhere?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106634421