RFR: 8313552: Fix -Wconversion warnings in JFR code [v3]

[Coleen Phillimore]

On Fri, 4 Aug 2023 19:27:03 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Greetings,
>> 
>> this change set removes -Wconversion warnings in the JFR code.
>> 
>> Testing: jdk_jfr
>> 
>> Thanks
>> Markus
>
> Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:
> 
>   writer casts nonreversible

Looks good.  Thank you for fixing all of these.

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Marked as reviewed by coleenp (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15152#pullrequestreview-1563498558