RFR: 8367603: Optimize exact division in BigDecimal [v21]

[fabioromano1]

> A formula to lower the overestimate for the precision of an exact quotient, without introducing too expensive operations of division on numerator and denominator.

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

  Added tests for extreme scale cases

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27271/files
  - new: https://git.openjdk.org/jdk/pull/27271/files/3f5574d6..1eafedff

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27271&range=20
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27271&range=19-20

  Stats: 22 lines in 1 file changed: 22 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27271.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27271/head:pull/27271

PR: https://git.openjdk.org/jdk/pull/27271