RFR: Include a version identifier in region sampling protocol for visualizer

Tue Jul 12 19:59:21 UTC 2022

On Tue, 12 Jul 2022 16:32:28 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This change adds a new variable to the PerfData for region sampling. With this change, the visualizer is able to identify the version of the encoding used in the communication protocol with Shenandoah. This allows the same visualizer to operate with the original unmodified Shenandoah and the generational mode Shenandoah.

Thanks.

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Marked as reviewed by kdnilsen (Committer).

PR: https://git.openjdk.org/shenandoah/pull/152