RFR: 8077587: BigInteger Roots [v15]

[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:

  Revert "Use type long for bitLength instead of int"
  
  This reverts commit c8e1b8159206d9fb5532df7ccdf98abcab888f2c.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24898/files
  - new: https://git.openjdk.org/jdk/pull/24898/files/c8e1b815..aeef24cb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=14
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=13-14

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 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