RFR: 8352251: Implement JEP 518: JFR Cooperative Sampling [v23]

Wed May 21 22:07:56 UTC 2025

On Fri, 16 May 2025 22:15:25 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> We know which register we use in each platform so it should be same as getting any other register. You can always fallback to getting it from the frame as now for platforms other than x64 and aarch64.
>
> I will try to see what can be done.

Getting the bcp from the cpu context as per [fetch bcp from context](https://github.com/openjdk/jdk/pull/24296/commits/e502b84b82678a5cbc27fff73752e70c3c9bf180)

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PR Review Comment: https://git.openjdk.org/jdk/pull/24296#discussion_r2101253319