<i18n dev> [jdk21] RFR: 6960866: [Fmt-Ch] ChoiceFormat claims impossible and unimplemented functionality

[Justin Lu]

Please review this PR which backports https://github.com/openjdk/jdk/commit/6cb9ec32a68634f0b6f7461c9dc7ef0c0e59861d

Thank you

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Commit messages:
 - 6960866: [Fmt-Ch] ChoiceFormat claims impossible and unimplemented functionality

Changes: https://git.openjdk.org/jdk21/pull/125/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=125&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6960866
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/125.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/125/head:pull/125

PR: https://git.openjdk.org/jdk21/pull/125