RFR: 8370057: Correct scale handling of BigDecimal.sqrt

[Joe Darcy]

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

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Commit messages:
 - JDK-8370057: Correct scale handling of BigDecimal.sqrt

Changes: https://git.openjdk.org/jdk/pull/27882/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27882&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370057
  Stats: 7 lines in 2 files changed: 2 ins; 0 del; 5 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