This PR implements nth root computation for BigIntegers using Newton method. This PR is dependent by this [PR](https://github.com/openjdk/jdk/pull/24690).
------------- Commit messages: - Merge branch 'openjdk:master' into BigInteger-nth-root - Optimized nth root iteration loop - Systematization of special cases in BigInteger.pow(int) - Some optimizations - Optimized repeated squaring trick using cache for powers - Optimized BigInteger.pow(int) for single-word values - An optimization - Format code - Optimized computation of nth root's remainder - Delete useless folder - ... and 28 more: https://git.openjdk.org/jdk/compare/21b0f5ea...f9bfd22c Changes: https://git.openjdk.org/jdk/pull/24898/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8077587 Stats: 377 lines in 2 files changed: 343 ins; 15 del; 19 mod Patch: https://git.openjdk.org/jdk/pull/24898.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24898/head:pull/24898 PR: https://git.openjdk.org/jdk/pull/24898
