RFR: 8355719: Reduce memory consumption of BigInteger.pow() [v54]

[fabioromano1]

On Thu, 8 May 2025 15:48:30 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> fabioromano1 has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Suggested changes
>
> Please update the 2nd copyright year in `BigInteger`.
> 
> Otherwise looks good.
> As soon as you feel comfortable with your changes, let me know so that I can approve.
> 
> Thanks for yet another nice contribution!

@rgiulietti Could be useful [this optimization](https://github.com/openjdk/jdk/pull/24690#issuecomment-2846711109) for `int` bases whose result does not fit in a `long`?

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PR Comment: https://git.openjdk.org/jdk/pull/24690#issuecomment-2863674473