[jdk21] RFR: 8311825: Duplicate qualified enum constants not detected

Fri Jul 14 10:07:38 UTC 2023

Hi all,

This pull request contains a backport of commit [d1fa1a86](https://github.com/openjdk/jdk/commit/d1fa1a868636dc15e96d1b4bf4acf28257c9551f) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Jan Lahoda on 14 Jul 2023 and was reviewed by Vicente Romero.

Thanks!

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Commit messages:
 - Backport d1fa1a868636dc15e96d1b4bf4acf28257c9551f

Changes: https://git.openjdk.org/jdk21/pull/128/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=128&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311825
  Stats: 33 lines in 3 files changed: 31 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21/pull/128.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/128/head:pull/128

PR: https://git.openjdk.org/jdk21/pull/128