RFR: 8355719: Reduce memory consumption of BigInteger.pow() [v51]

[fabioromano1]

On Wed, 7 May 2025 15:46:16 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Did you make sure that the existing tests also cover the `unsignedLongPow()` sufficiently well?

@rgiulietti There are already the tests for `BigInteger`'s [pow](https://github.com/fabioromano1/jdk/blob/BigInteger-nth-root/test/jdk/java/math/BigInteger/BigIntegerTest.java#L219), since the code of `unsignedLongPow()` is basically equivalent to that one in the current implementation.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/24690#issuecomment-2859155908