[Bug lto/84105] [8 regression] Segmentation fault in pp_tree_identifier() during LTO

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84105

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Started with r256685.

The problem is in dump_generic_node:

    case FUNCTION_TYPE:
    case METHOD_TYPE:
...
      if (TYPE_NAME (node) && DECL_NAME (TYPE_NAME (node)))
        dump_decl_name (pp, TYPE_NAME (node), flags);

(gdb) print node
$21 = <function_type 0x7fffef652dc8 printfn_t>
(gdb) print node.type_common.name
$22 = <identifier_node 0x7fffef654730 printfn_t>

TYPE_NAME is an IDENTIFIER_NODE, whereas we're expecting a DECL_P, and we ICE.