RFR: 8310335 JFR: Modernize collections and switch statements [v3]

[Markus Grönlund]

On Tue, 20 Jun 2023 23:26:13 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Could I have a review of an update to the jfr modules to use more recent APIs and language constructs.
>> 
>> Testing: test/jdk/jdk/jfr
>> 
>> Thanks
>> Erik
>
> Erik Gahlin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Unmodernize TestAgentEvent.java. Will be handled seperately, suitable for JDK 21 backport

Marked as reviewed by mgronlun (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14547#pullrequestreview-1490546834