RFR: 8328341: Remove deprecated per-thread compiler stats in sun.management

[Eirik Bjørsnøs]

On Mon, 18 Mar 2024 09:42:13 GMT, Eirik Bjørsnøs <eirbjo at openjdk.org> wrote:

> Please review this cleanup PR which removes per-thread compiler stats from `sun.management`
> 
> This removes:
> 
> * The deprecated interface method `HotspotCompilationMBean.getCompilerThreadStats()` along with the implementation method in `HotspotCompilation`
> * The class returned by these methods, `CompilerThreadStat`
> * The nested class `HotspotCompilation.CompilerThreadInfo` which now falls out of use
> * The field `HotspotCompilation.threads`, along with its initialization in `initCompilerCounters`
> 
> This was initially discussed here: https://mail.openjdk.org/pipermail/serviceability-dev/2024-March/054589.html
> 
> Testing and verification: As this is purely a removal and cleanup PR of unused code, no updates are made on the testing side. I have verified that the string `getCompilerThreadStats` is not found in OpenJDK after this PR.

Thanks for reviewing, Kevin!

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PR Comment: https://git.openjdk.org/jdk/pull/18344#issuecomment-2007634465