[riscv-port-jdk11u:riscv-port] RFR: JDK-8327284: Use correct register in riscv_enc_fast_unlock()

[Fei Yang]

On Tue, 5 Mar 2024 08:44:18 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, The same issue also exists in the riscv-port-jdk11u. It's already fixed in the jdk17u version above, for performance reasons, I'd like to backport it to this repo.
> 
> Testing:
> 
> - [x] Run tier1 tests on SOPHGO SG2042 (release)

Looks good. Please retrigger GHA testing. Thanks.

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Marked as reviewed by fyang (Lead).

PR Review: https://git.openjdk.org/riscv-port-jdk11u/pull/9#pullrequestreview-1926828402