p = (P_)&((StgRetDyn *)p)->payload[0];
size = RET_DYN_BITMAP_SIZE;
p = scavenge_small_bitmap(p, size, bitmap);
// skip over the non-ptr words
p = (P_)&((StgRetDyn *)p)->payload[0];
size = RET_DYN_BITMAP_SIZE;
p = scavenge_small_bitmap(p, size, bitmap);
// skip over the non-ptr words