[lworld+fp16] RFR: 8341368: Refactor to use nextUp/nextDown and scalb in Float16 impl. and tests

[Joe Darcy]

On Fri, 4 Oct 2024 15:42:19 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Make use of `Float16.nextUp()`, `Float16.nextDown()`, `Float16.scalb()` in tests and code.

Marked as reviewed by darcy (Committer).

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PR Review: https://git.openjdk.org/valhalla/pull/1265#pullrequestreview-2348595138