RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v50]

[Johannes Bechberger]

On Wed, 4 Jun 2025 15:00:07 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> Why is this a problem? We don't leak `&t` outside of `create_timer_for_thread`.
>
> But I can start using the passed-in parameter `timerid` directly, which should make the code less confusing.

I pushed the modifications.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2126863235