RFR: 8358540: Enhance MathUtils in view of FloatingDecimal enhancements [v2]

[Raffaello Giulietti]

> Another step in enhancing floating-point <-> decimal conversions.

Raffaello Giulietti has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into 8358540
 - 8358540: Enhance MathUtils in view of FloatingDecimal enhancements

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25641/files
  - new: https://git.openjdk.org/jdk/pull/25641/files/555f6869..a741b105

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25641&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25641&range=00-01

  Stats: 16477 lines in 314 files changed: 14667 ins; 1100 del; 710 mod
  Patch: https://git.openjdk.org/jdk/pull/25641.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25641/head:pull/25641

PR: https://git.openjdk.org/jdk/pull/25641