[jdk17u-dev] RFR: 8288992: AArch64: CMN should be handled the same way as CMP

[Goetz Lindenmaier]

I backport this for parity with 17.0.5-oracle.

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Commit messages:
 - Backport cc2b79270445ccfb2181894fed2edfd4518a2904

Changes: https://git.openjdk.org/jdk17u-dev/pull/602/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=602&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/jdk17u-dev/pull/602.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/602/head:pull/602

PR: https://git.openjdk.org/jdk17u-dev/pull/602