RFR: 8333264: Remove unused resolve_sub_helper declaration after JDK-8322630

[Roberto Castañeda Lozano]

On Thu, 30 May 2024 12:39:17 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> The `resolve_sub_helper` declaration is unused. Noticed this when working on the Valhalla merge.
> 
> Thanks,
> Tobias

Looks good and trivial.

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Marked as reviewed by rcastanedalo (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19476#pullrequestreview-2088185262