[jdk19u] RFR: 8292780: misc tests failed "assert(false) failed: graph should be schedulable"

[Tobias Hartmann]

Backport of [JDK-8292780](https://bugs.openjdk.java.net/browse/JDK-8292780). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8292780: misc tests failed "assert(false) failed: graph should be schedulable"

Changes: https://git.openjdk.org/jdk19u/pull/85/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=85&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292780
  Stats: 52 lines in 2 files changed: 51 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk19u/pull/85.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/85/head:pull/85

PR: https://git.openjdk.org/jdk19u/pull/85