[Bug ipa/109983] [12/13/14 regression] Wireshark compilation hangs with -O2 -fipa-pta

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109983

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
I let perf spin for a while and got this w/ 13:

```
$ perf record gcc-13 -O2 -fipa-pta -c packet-rnsap.c.i
[^C'd after ~2 minutes]

$ perf report
    43.18%  cc1      cc1                      [.] bitmap_ior_into
    40.43%  cc1      cc1                      [.] bitmap_bit_p
     9.65%  cc1      cc1                      [.] bitmap_set_bit
     2.87%  cc1      cc1                      [.] solve_graph
     0.98%  cc1      cc1                      [.] solution_set_expand
     0.80%  cc1      cc1                      [.] add_graph_edge
     0.39%  cc1      cc1                      [.] find
     0.04%  cc1      cc1                      [.]
symbol_table::decl_assembler_name_hash
     0.04%  cc1      libc.so.6                [.] malloc
     0.03%  cc1      cc1                      [.] ggc_set_mark
     0.03%  cc1      cc1                      [.] verify_ssa
     0.03%  cc1      cc1                      [.] gt_ggc_mx_lang_tree_node
     0.03%  cc1      cc1                      [.] walk_gimple_op
     0.03%  cc1      cc1                      [.] walk_tree_1
     0.03%  cc1      cc1                      [.]
base_pool_allocator<memory_block_pool>::allocate
     0.03%  cc1      cc1                      [.] solve_constraints
     0.02%  cc1      cc1                      [.]
bitmap_list_insert_element_after
     0.02%  cc1      cc1                      [.] verify_gimple_call
     0.02%  cc1      libc.so.6                [.] cfree
     0.02%  cc1      cc1                      [.] ggc_internal_alloc
     0.02%  cc1      cc1                      [.] verify_gimple_in_cfg
     0.02%  cc1      cc1                      [.] equiv_class_lookup_or_add
     0.02%  cc1      cc1                      [.] verify_gimple_stmt
     0.02%  cc1      [unknown]                [k] 0xffffffff89000b90
     0.02%  cc1      cc1                      [.] do_per_function
     0.01%  cc1      cc1                      [.]
hash_table<default_hash_traits<tree_node*>, false, xcallocator>::verify
     0.01%  cc1      cc1                      [.] contains_struct_check
     0.01%  cc1      cc1                      [.]
hash_table<hash_map<nofree_string_hash, align_flags,
simple_hashmap_traits<default_hash_traits<nofree_string_hash>, align_flags>
>::hash_entry, false, xcallocator>::verify
     0.01%  cc1      cc1                      [.] free_dominance_info
     0.01%  cc1      cc1                      [.]
operands_scanner::get_expr_operands
     0.01%  cc1      cc1                      [.] verify_expr_location_1
     0.01%  cc1      cc1                      [.] _cpp_lex_direct
     0.01%  cc1      cc1                      [.] verify_location
     0.01%  cc1      cc1                      [.] (anonymous
namespace)::dom_info::calc_dfs_tree_nonrec
     0.01%  cc1      cc1                      [.] (anonymous
namespace)::dom_info::calc_idoms
[...]
```