The inclusion in the Revised Statutes, by revision, compilation or otherwise, of the substance of acts of the legislature, which, for their operative force and effect, depend upon the adoption thereof or of any proposal thereunder by the voters of the state or any political subdivision or district thereof, and commonly known as referendum acts, shall not be construed to require the resubmission of any such act or proposal to any body of voters who had adopted any such act or proposal prior to the effective date of the Revised Statutes, and any and all such acts so adopted prior to the effective date of the Revised Statutes shall be and remain valid and operative as revised, compiled or otherwise included in the Revised Statutes, and the adoption of any such proposal shall be and remain valid and operative in like manner.