RFR: 8343829: Unify decimal and hexadecimal parsing in FloatingDecimal [v5]

[Raffaello Giulietti]

> See the JBS bug for some details.

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 seven additional commits since the last revision:

 - Merge branch 'master' into 8343829
 - Redacted comments.
 - Merge branch 'master' into 8343829
 - Minors in comments.
 - Removed repeated comment.
 - Refactoring some code and comments.
 - 8343829: Unify decimal and hexadecimal parsing in FloatingDecimal

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22737/files
  - new: https://git.openjdk.org/jdk/pull/22737/files/cb7bb259..092755b4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22737&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22737&range=03-04

  Stats: 33016 lines in 808 files changed: 16959 ins; 12980 del; 3077 mod
  Patch: https://git.openjdk.org/jdk/pull/22737.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22737/head:pull/22737

PR: https://git.openjdk.org/jdk/pull/22737