RFR: 8342818: Implement CPU Time Profiling for JFR [v4]

[Johannes Bechberger]

On Thu, 31 Oct 2024 23:52:05 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> This is not always the case, as far as I know.
>
> It should be ok to start from the anchor frame.
> 
> Please see JfrNativeSamplerCallback::call().

Interestingly, removing the lines reduced the number of failed samples. Maybe we should also improve ASGCT (from where the lines come)?

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1832648915