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

[Markus Grönlund]

On Mon, 26 May 2025 06:23:08 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> You can have a field as a pointer: timer_t* timer and test it, timer != nullptr.
>
> Wouldn't I need to store it somewhere?

Of course. A pointer is less space compared to an inlined struct AND a bool.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106793364