RFR: 8077587: BigInteger Roots [v16]

[fabioromano1]

> This PR implements nth root computation for BigIntegers using Newton method.

fabioromano1 has updated the pull request incrementally with one additional commit since the last revision:

  Do first refinement loop only if shift == 0

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24898/files
  - new: https://git.openjdk.org/jdk/pull/24898/files/aeef24cb..307af7f6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=15
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=14-15

  Stats: 30 lines in 1 file changed: 12 ins; 11 del; 7 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