[riscv-port-jdk17u:riscv-port] RFR: 8305006: Use correct register in riscv_enc_fast_unlock()

[Vladimir Kempik]

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). because JDK-8296136 is already present in 17.0.7(jdk17u-dev repo) and riscv-port-jdk17u too. so I created a new issue for this PR.
> 
> Testing:
> 
> - Tier1 passed without new failure on qemu (release).

Marked as reviewed by vkempik (Reviewer).

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PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/27#pullrequestreview-1360267848