[lworld+fp16] RFR: 8339252: Add method float16Value() to BigInteger and BigDecimal [v6]

[Joe Darcy]

On Wed, 4 Sep 2024 21:54:05 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> This patch adds `float16Value()` to `BigInteger` and `BigDecimal`, as well as `Float16.valueOf(BigDecimal)`.
>
> Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added @see to valueOf(BigDecimal).

Marked as reviewed by darcy (no project role).

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PR Review: https://git.openjdk.org/valhalla/pull/1228#pullrequestreview-2281525502