Add `powExact()` and `unsignedPowExact()` methods that operate on integer values arguments. Further, add `unsignedMultiplyExact` methods as well.
------------- Commit messages: - 8355992: Add some useful "exact" methods to Math and StrictMath Changes: https://git.openjdk.org/jdk/pull/25003/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25003&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8355992 Stats: 324 lines in 2 files changed: 324 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/25003.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25003/head:pull/25003 PR: https://git.openjdk.org/jdk/pull/25003
