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

[David Holmes]

On Mon, 26 May 2025 06:29:03 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> Also, is raw_thread == nullptr even possible? For the same reasons.
>
> `!raw_thread->is_Java_thread()` I found it during testing.

What thread was it, and how did it reach this code?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2119984783