[jdk19u] RFR: 8291599: Assertion in PhaseIdealLoop::skeleton_predicate_has_opaque after JDK-8289127

[Tobias Hartmann]

Backport of [JDK-8291599](https://bugs.openjdk.java.net/browse/JDK-8291599). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8291599: Assertion in PhaseIdealLoop::skeleton_predicate_has_opaque after JDK-8289127

Changes: https://git.openjdk.org/jdk19u/pull/29/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=29&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291599
  Stats: 181 lines in 4 files changed: 155 ins; 23 del; 3 mod
  Patch: https://git.openjdk.org/jdk19u/pull/29.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/29/head:pull/29

PR: https://git.openjdk.org/jdk19u/pull/29