[Bug symtab/30799] New: [gdb/symtab] hang in inherit_abstract_dies

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30799

            Bug ID: 30799
           Summary: [gdb/symtab] hang in inherit_abstract_dies
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I build gdb with gcc 7.5.0 and -O2 -flto -flto-partition=one, and ran into
timeouts in gdb.gdb/*.exp.

The hang seems to be related to a self-referencing DIE:
...
 <2><91dace>: Abbrev Number: 405 (DW_TAG_label)
    <91dad0>   DW_AT_abstract_origin: <0x91dace>
...

We're stuck in this loop in inherit_abstract_dies:
...
      /* For each CHILD_DIE, find the corresponding child of                    
         ORIGIN_DIE.  If there is more than one layer of                        
         DW_AT_abstract_origin, follow them all; there shouldn't be,            
         but GCC versions at least through 4.4 generate this (GCC PR            
         40573).  */
      die_info *child_origin_die = child_die;
      dwarf2_cu *child_origin_cu = cu;
      while (true)
        {
          attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
                              child_origin_cu);
          if (attr == nullptr)
            break;


          child_origin_die = follow_die_ref (child_origin_die, attr,
                                             &child_origin_cu);
        }
...

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