[Bug ipa/79931] ICE in dump_possible_polymorphic_call_targets with -fdump-ipa-all -O2

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79931

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Related to PR 66301 but not exactly the same.
here is the full testcase:
cc1plus: internal compiler error: in dump_possible_polymorphic_call_targets, at
ipa-devirt.c:3361
0xb6b53b dump_possible_polymorphic_call_targets(_IO_FILE*, tree_node*, long,
ipa_polymorphic_call_context const&)
        ../../gcc/gcc/ipa-devirt.c:3361
0x96e693 dump_possible_polymorphic_call_targets(_IO_FILE*, cgraph_edge*)
        ../../gcc/gcc/ipa-utils.h:144
0x96e693 walk_polymorphic_call_targets
        ../../gcc/gcc/cgraphunit.c:849
0x96e693 analyze_functions
        ../../gcc/gcc/cgraphunit.c:1115
0x96f3f7 symbol_table::finalize_compilation_unit()
        ../../gcc/gcc/cgraphunit.c:2562
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