RFR: 8256811: Delayed/missed jdwp class unloading events [v3]

[Zhengyu Gu]

On Fri, 24 Jun 2022 21:49:00 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> You should also remove the following from the hotspot ProblemList.txt:
> 
> `vmTestbase/nsk/jdi/HiddenClass/events/events001.java 8257705 generic-all`
> 
> Try to reproduce without your fix, and then verify your fix is addressing the failure.

I did test it locally, unless you want to make [JDK-8257705](https://bugs.openjdk.org/browse/JDK-8257705) is a duplicate?

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PR: https://git.openjdk.org/jdk/pull/9168