RFR: 8368985: Small Float16 refactorings [v3]

[Raffaello Giulietti]

On Wed, 1 Oct 2025 17:22:17 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> A few more small cleanups to Float16 and its tests.
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Respond to review feedback.

Marked as reviewed by rgiulietti (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27587#pullrequestreview-3290358763