RFR: 8355992: Add some useful "exact" methods to Math and StrictMath

[Raffaello Giulietti]

On Fri, 2 May 2025 11:47:32 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Add `powExact()` and `unsignedPowExact()` methods that operate on integer values arguments.
> Further, add `unsignedMultiplyExact` methods as well.

Tests will be added once the CSR has been approved.

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PR Comment: https://git.openjdk.org/jdk/pull/25003#issuecomment-2847026026