Constructor macro for honsed vcd-multivector-p structures.
(make-honsed-vcd-multivector [:bits <bits>]
This is identical to make-vcd-multivector, except
that we hons the structure we are
This is an ordinary honsing make- macro introduced by
(defmacro make-honsed-vcd-multivector (&rest args)
args '((:bits) (:idcodes))