RFR: 8313785: Fix -Wconversion warnings in prims code [v2]

[Dean Long]

On Fri, 4 Aug 2023 23:24:45 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Why not? It's the same and casts the int where it's needed to be an int.
To me the checked_cast looks less ugly in the initialization vs at the uses sites, but in this case with only one use it doesn't really matter.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15160#discussion_r1286536069