[jdk17u] RFR: 8268019: C2: assert(no_dead_loop) failed: dead loop detected

[Tobias Hartmann]

Backport of [JDK-8268019](https://bugs.openjdk.java.net/browse/JDK-8268019). Applies cleanly.

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Commit messages:
 - 8268019: C2: assert(no_dead_loop) failed: dead loop detected

Changes: https://git.openjdk.java.net/jdk17u/pull/17/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=17&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268019
  Stats: 83 lines in 2 files changed: 78 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/17.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/17/head:pull/17

PR: https://git.openjdk.java.net/jdk17u/pull/17