RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v17]

[Markus Grönlund]

On Tue, 27 May 2025 16:29:05 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> If it's typedeffed as an int or a pointer (in sys/types.h or signal.h), then it won't even need a forward declaration. Try without it and see what happens.
>
> It seems to normally be a pointer. I'll try the forward declaration later.

Don't worry if it's too hard. It would just be a nice thing to eliminate these special includes from the header file.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2109666735