RFR: JDK-8289524: Add JFR JIT restart event [v8]

[Lutz Schmidt]

On Mon, 18 Jul 2022 08:15:29 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:
> 
>   BlobType got a new package too

With all the fine-tuning, changes look even better now. And there is a test now so we get alerted if anything breaks. Thanks!

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Marked as reviewed by lucy (Reviewer).

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