RFR: JDK-8289524: Add JFR JIT restart event [v3]

[Lutz Schmidt]

On Thu, 14 Jul 2022 14:26:01 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> The JIT compiler restarts (see restart_compiler in NMethodSweeper::sweep_code_cache) would be a helpful addition to the JFR events. Currently we log the JIT stop operations in JFR (EventCodeCacheFull) but no restart.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Bring back JitRestart event, add codeCacheMaxCapacity

Changes look good. 
Now you can relate the freed memory to what's available in total.

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Marked as reviewed by lucy (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9334