RFR: 8238197: JFR: Rework setting and getting EventHandler

[Erik Gahlin]

On Wed, 9 Jun 2021 21:29:51 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Greetings,
> 
> please help review this changeset which moves the setting and getting of event handlers to native to avoid allocations.
> 
> Testing: jdk_jfr, stress
> 
> Thanks
> Markus

Marked as reviewed by egahlin (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4445