[jdk19u] RFR: 8288992: AArch64: CMN should be handled the same way as CMP

[Tobias Hartmann]

Backport of [JDK-8288992](https://bugs.openjdk.java.net/browse/JDK-8288992). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8288992: AArch64: CMN should be handled the same way as CMP

Changes: https://git.openjdk.org/jdk19u/pull/36/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19u&pr=36&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288992
  Stats: 9 lines in 2 files changed: 3 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk19u/pull/36.diff
  Fetch: git fetch https://git.openjdk.org/jdk19u pull/36/head:pull/36

PR: https://git.openjdk.org/jdk19u/pull/36