RFR: 8365191: Cleanup after removing LockingMode related code [v2]

[Fredrik Bredberg]

On Wed, 24 Sep 2025 12:48:00 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> According to @mur47x111, they still need this line for their fast locking implementation.
>
> 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.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27448#discussion_r2375703603