[jdk17u-dev] RFR: 8296136: Use correct register in aarch64_enc_fast_unlock()

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

Omitted riskv part. Will mark as clean.

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Commit messages:
 - Backport 7619602c365acee73a490f05be2bd0d3dd09d7a4

Changes: https://git.openjdk.org/jdk17u-dev/pull/1005/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1005&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296136
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1005.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1005/head:pull/1005

PR: https://git.openjdk.org/jdk17u-dev/pull/1005