[jdk21] RFR: 8312163: Crash in dominance check when compiling unnamed patterns

[Aggelos Biboudis]

8312163: Crash in dominance check when compiling unnamed patterns

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Commit messages:
 - Backport 1fc726a8b34fcd41dae12a6d7c63232f9ccef3f4

Changes: https://git.openjdk.org/jdk21/pull/134/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=134&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312163
  Stats: 73 lines in 4 files changed: 70 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21/pull/134.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/134/head:pull/134

PR: https://git.openjdk.org/jdk21/pull/134