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

[Aggelos Biboudis]

Intra-case domination should be affected by the presence of a guard. A missing check in dominance ensures that requirement.

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

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

Changes: https://git.openjdk.org/jdk/pull/15515/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15515&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314632
  Stats: 69 lines in 3 files changed: 68 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15515.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15515/head:pull/15515

PR: https://git.openjdk.org/jdk/pull/15515