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

[Fei Yang]

On Fri, 24 Mar 2023 01:41:29 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Please help review this backport to riscv-port-jdk17u.
> Backport of [JDK-8296136](https://bugs.openjdk.org/browse/JDK-8296136).
> 
> Testing:
> 
> - Tier1 passed without new failure on qemu (release).

Now we have three new JBS versions for the backport repos: "repo-riscv-port-17", "repo-riscv-port"11", "repo-riscv-port-8".

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PR Comment: https://git.openjdk.org/riscv-port-jdk17u/pull/27#issuecomment-1486087186