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

[Johannes Bechberger]

On Sun, 25 May 2025 21:35:44 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> How long the stack walking took. But it's probably irrelevant with the new design.
>
>> How long the stack walking took. But it's probably irrelevant with the new design.
> 
> It will probably confuse user more than help them.

I removed it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106946609