[jdk21u] RFR: 8314632: Intra-case dominance check fails in the presence of a guard

[Aggelos Biboudis]

8314632: Intra-case dominance check fails in the presence of a guard

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Commit messages:
 - Backport 81f8c57e4a14e0186f608cbe5a899322df80fd30

Changes: https://git.openjdk.org/jdk21u/pull/162/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=162&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314632
  Stats: 47 lines in 3 files changed: 46 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/162.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/162/head:pull/162

PR: https://git.openjdk.org/jdk21u/pull/162