RFR: 8377223: Port fdlibm atanh to Java [v4]

[Raffaello Giulietti]

On Thu, 19 Feb 2026 15:13:25 GMT, Anton Artemov <aartemov at openjdk.org> wrote:

>> Hi, please consider the following changes:
>> 
>> This is a port of FDLIBM atanh method.
>
> Anton Artemov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8377223: Addressed reviewer's comments.

Looks good to me, except for my comment in the [CSR](https://bugs.openjdk.org/browse/JDK-8378161).

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PR Comment: https://git.openjdk.org/jdk/pull/29782#issuecomment-3927940028