[jdk17u-dev] RFR: 8291599: Assertion in PhaseIdealLoop::skeleton_predicate_has_opaque after JDK-8289127

[Goetz Lindenmaier]

I backport this for parity with 17.0.6-oracle.

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Commit messages:
 - Backport 37df5f56259429482cfdbe38e8b6256f1efaf9e8

Changes: https://git.openjdk.org/jdk17u-dev/pull/770/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=770&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/jdk17u-dev/pull/770.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/770/head:pull/770

PR: https://git.openjdk.org/jdk17u-dev/pull/770