Function mi_unlikely

3rd/mimalloc-2.0.9/src/alloc.c:463–465

      _mi_page_retire(page);
    }
    else if mi_unlikely(mi_page_is_in_full(page)) {
      _mi_page_unfull(page);
    }
  }
  else {
    _mi_free_block_mt(page,block);