[jdk18u] RFR: 8284944: assert(cnt++ < 40) failed: infinite cycle in loop optimization

[Tobias Hartmann]

Backport of [JDK-8284944](https://bugs.openjdk.java.net/browse/JDK-8284944). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8284944: assert(cnt++ < 40) failed: infinite cycle in loop optimization

Changes: https://git.openjdk.org/jdk18u/pull/163/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk18u&pr=163&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284944
  Stats: 127 lines in 2 files changed: 125 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk18u/pull/163.diff
  Fetch: git fetch https://git.openjdk.org/jdk18u pull/163/head:pull/163

PR: https://git.openjdk.org/jdk18u/pull/163