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2021-07-25T08:19:38.994541Z
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Add __diagused

This can be used for variables which are only used with either
INVARIANTS or WITNESS. Without any annotation they run into dead store
warnings from cc --analyze and always annotating with __unused may hide
bad vars when it should not.

Reviewed by:	kib, markj
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D31185

(cherry picked from commit b9296725cf99696b48926270a553044522d6e344)

Git Hash:   f0d0344742365c8fd548a2be6a31f0a9fe9b54a8
Git Author: mjg@FreeBSD.org
END