DW_AT_upper_bound
attrnum = DW_AT_upper_bound;
ret = ctf_dwarf_attribute(cup, range, DW_AT_upper_bound, &attr);
case DW_AT_upper_bound:
case DW_AT_upper_bound:
case DW_AT_upper_bound:
case DW_AT_upper_bound:
case DW_AT_upper_bound:
case DW_AT_upper_bound: