RFR: JDK-8289524: Add JFR JIT restart event

[Johannes Bechberger]

On Thu, 30 Jun 2022 13:17:09 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.

Looks good and simple

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Marked as reviewed by parttimenerd at github.com (no known OpenJDK username).

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