optimize mem usage of j_cp and k_cp for mc_ao2mo
optimize mem usage of j_cp and k_cp for mc_ao2mo

sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf