RFR: 8369051: More small Float16 refactorings

[Raffaello Giulietti]

On Thu, 2 Oct 2025 16:22:56 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> As a follow-up to https://git.openjdk.org/jdk/pull/27587, I went through the code of Float16.java and found a few more cases where hex integer constants could be replaced by symbolic constants. A few other small changes included too.

Marked as reviewed by rgiulietti (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27610#pullrequestreview-3295444438