RFR: 8365191: Cleanup after removing LockingMode related code [v3]

[Fredrik Bredberg]

On Wed, 24 Sep 2025 12:55:51 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

>> Oh you were supposed to leave the field in vmStructs_jvmci.cpp and remove it from this one.
>
> Yea, I got it all mixed up in my head. Will fix it.

Fixed

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PR Review Comment: https://git.openjdk.org/jdk/pull/27448#discussion_r2375717181