RFR: 8355719: Reduce memory consumption of BigInteger.pow() [v55]

[duke]

On Thu, 8 May 2025 16:48:40 GMT, fabioromano1 <duke at openjdk.org> wrote:

>> This PR optimizes `BigInteger.pow(int)` method. The primary enhancement in `pow()` is not concerned most on execution time, but rather in memory optimization, because the PR implementation does the "shift of the exponent" squaring the result rather than the base, so the base is not squared like in the current implementation, and this permits to save about half of the memory.
>
> fabioromano1 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Code simplification

@fabioromano1 
Your change (at version 261dd315537f6135a4f065b3dcbcfe045d4a27db) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/24690#issuecomment-2867305168