op_first cUNOP->op_first opindex
op_last cBINOP->op_last opindex
op_other cLOGOP->op_other opindex
-op_children cLISTOP->op_children U32
op_pmreplroot cPMOP->op_pmreplroot opindex
op_pmreplrootgv *(SV**)&cPMOP->op_pmreplroot svindex
op_pmreplstart cPMOP->op_pmreplstart opindex