RFR: 8364750: Remove unused declaration in jvm.cpp

[Aleksey Shipilev]

On Mon, 11 Aug 2025 17:49:15 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Please review this trivial change to remove the declaration of the native JVM function that I removed in [JDK-8364187](https://bugs.openjdk.org/browse/JDK-8364187).
> Tested with tier1 on Oracle supported platforms as sanity test (in progress).

Looks fine and trivial.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26732#pullrequestreview-3107226198