RFR: JDK-8289524: Add JFR JIT restart event [v5]

[Coleen Phillimore]

On Fri, 15 Jul 2022 14:21:06 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:
> 
>   add test for JitRestart

test/jdk/jdk/jfr/event/compiler/TestJitRestart.java line 33:

> 31: import jdk.test.lib.jfr.EventNames;
> 32: import jdk.test.lib.jfr.Events;
> 33: import sun.hotspot.WhiteBox;

This package has been removed. Please use jdk.test.whitebox.WhiteBox.

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