[Bug 264094] VNET and DPCPU defined in modules panic on use on arm64 after LLVM 14 import due to new linker relaxation

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 12 Dec 2022 20:36:19 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264094

--- Comment #22 from Jessica Clarke <jrtc27@freebsd.org> ---
Using

    __attribute__((used,section("set_vnet_entry"),alias("vnet_entry_"#_n)))
    static _t vnet_alias_##_n;

as a hacky way to forward-declare the thing without the compiler complaining
seems to work.

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