For purposes of sections
1052,
1053, and
1054 of this title, all employees of all corporations which are members of a controlled group of corporations (within the meaning of section
1563
(a) of title
26, determined without regard to section
1563
(a)(4) and (e)(3)(C) of title
26) shall be treated as employed by a single employer. With respect to a plan adopted by more than one such corporation, the minimum funding standard of section
1082 of this title shall be determined as if all such employers were a single employer, and allocated to each employer in accordance with regulations prescribed by the Secretary of the Treasury.