[lworld+fp16] RFR: 8341639: Add float16ToShortBits(), signum(), copySign() to Float16

[Joe Darcy]

On Mon, 7 Oct 2024 13:21:13 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> These common operations are currently lacking for Float16, and should be added.

New API looks fine.

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Marked as reviewed by darcy (Committer).

PR Review: https://git.openjdk.org/valhalla/pull/1268#pullrequestreview-2352434021