RFR: 8342818: Implement CPU Time Profiling for JFR [v43]

[Johannes Bechberger]

On Wed, 30 Apr 2025 12:59:28 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> I probably found the issue: `_active_signal_handlers` is never set to zero.
>
> I fixed it.

And it was probably the same issue that kept me from fixing the version that doesn't depend on your PR

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r2071419362