RFR: 8370057: Correct scale handling of BigDecimal.sqrt [v2]

[Joe Darcy]

> Correct scale handling of BigDecimal.sqrt to conform to IEEE 754.

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

  Respond to review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27882/files
  - new: https://git.openjdk.org/jdk/pull/27882/files/23936495..aa5d60fe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27882&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27882&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27882.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27882/head:pull/27882

PR: https://git.openjdk.org/jdk/pull/27882