DW_AT_sibling
if (want_AT_sibling && attr == DW_AT_sibling) {
DW_AT_sibling != attr->ar_attribute &&
case DW_AT_sibling:
case DW_AT_sibling:
case DW_AT_sibling:
if(a->ar_attribute == DW_AT_sibling) {
DW_AT_sibling,