[jdk13u-dev] RFR: 8233452: java.math.BigDecimal.sqrt() with RoundingMode.FLOOR results in incorrect result

[Yuri Nesterenko]

jdk13u is also affected. I would like to downport it, too. Applies clean. Related tests pass, and the modified test fails and pass before and after the fix as expected.

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Commit messages:
 - Backport 006b5e0f964db3d957af0e2956890bc8a53e3cb4

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/23/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=23&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233452
  Stats: 670 lines in 2 files changed: 617 ins; 10 del; 43 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/23.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/23/head:pull/23

PR: https://git.openjdk.java.net/jdk13u-dev/pull/23