[jdk18u] RFR: 8280696: C2 compilation hits assert(is_dominator(c, n_ctrl)) failed

[Tobias Hartmann]

Backport of [JDK-8280696](https://bugs.openjdk.java.net/browse/JDK-8280696). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8280696: C2 compilation hits assert(is_dominator(c, n_ctrl)) failed

Changes: https://git.openjdk.org/jdk18u/pull/161/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk18u&pr=161&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8280696
  Stats: 15 lines in 2 files changed: 4 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/jdk18u/pull/161.diff
  Fetch: git fetch https://git.openjdk.org/jdk18u pull/161/head:pull/161

PR: https://git.openjdk.org/jdk18u/pull/161