PMC_MDEP_CLASS_INDEX_IAF
npmc += md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAF].pcd_num;
npmc += md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAF].pcd_num;
pcd = &md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAF];
MPASS(nclasses >= PMC_MDEP_CLASS_INDEX_IAF);