[jdk21] RFR: 8309902: C2: assert(false) failed: Bad graph detected in build_loop_late after JDK-8305189

[Tobias Hartmann]

Backport of [JDK-8309902](https://bugs.openjdk.java.net/browse/JDK-8309902). Applies cleanly.

Thanks,
Tobias

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Commit messages:
 - 8309902: C2: assert(false) failed: Bad graph detected in build_loop_late after JDK-8305189

Changes: https://git.openjdk.org/jdk21/pull/83/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=83&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309902
  Stats: 64 lines in 2 files changed: 58 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/83.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/83/head:pull/83

PR: https://git.openjdk.org/jdk21/pull/83