https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64059
--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Breakpoint 1, ipa_polymorphic_call_context::get_dynamic_type
(this=0x7fffffffdb90, instance=0x7ffff7271678, otr_object=0x7ffff7271678,
otr_type=0x7ffff73dd1f8,
call=0x7ffff73e4ab0) at ../../gcc/gcc/ipa-polymorphic-call.c:1593
1593 = get_deref_alias_set (TREE_TYPE (BINFO_VTABLE (TYPE_BINFO
(otr_type))));
(gdb) l
1588 /* We look for vtbl pointer read. */
1589 ao.size = POINTER_SIZE;
1590 ao.max_size = ao.size;
1591 if (otr_type)
1592 ao.ref_alias_set
1593 = get_deref_alias_set (TREE_TYPE (BINFO_VTABLE (TYPE_BINFO
(otr_type))));
1594
1595 if (dump_file)
1596 {
1597 fprintf (dump_file, "Determining dynamic type for call: ");
(gdb) p otr_type->type_non_common.binfo
$1 = (tree) 0x0
