Example showing access to rnglists on an Attribute.

This is accessing DWARF5 .debug_rnglists. The section first appears in DWARF5.

*/
int example_rnglist_for_attribute(Dwarf_Attribute attr,
    Dwarf_Unsigned attrvalue,Dwarf_Error <em>error)
{
    /</em>  attrvalue must be the DW_AT_ranges
        DW_FORM_rnglistx or DW_FORM_sec_offset value
        extracted from attr. 