RFR: 8314265: Fix -Wconversion warnings in miscellaneous runtime code [v8]

[Coleen Phillimore]

On Thu, 17 Aug 2023 07:53:07 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Thanks Christian.  I'll revert to use the static cast.  One of the cases has a comment why.
>
> That looks good!

Thanks Christian!

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PR Review Comment: https://git.openjdk.org/jdk/pull/15233#discussion_r1297135202