[lworld+fp16] RFR: 8339599: Add nextUp(), nextDown(), scalb() to Float16

[duke]

On Tue, 10 Sep 2024 19:17:53 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Adding these to Float16 rather than Math|StrictMath.

@rgiulietti 
Your change (at version a28cdc0297d35321792acfe8d1f3ec48780728cf) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/valhalla/pull/1238#issuecomment-2342916097