RFR: 8343829: Unify decimal and hexadecimal parsing in FloatingDecimal [v4]

[Raffaello Giulietti]

> See the JBS bug for some details.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  Redacted comments.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22737/files
  - new: https://git.openjdk.org/jdk/pull/22737/files/d055d0ea..cb7bb259

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22737&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22737&range=02-03

  Stats: 126 lines in 1 file changed: 47 ins; 49 del; 30 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