[PR lto/84105] handle TYPE_IDENTIFIERs for FUNCTION_TYPEs in the gimple pretty printer

[Aldy Hernandez]

Hi!

As discussed in the PR, the ICE here happens 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 
bad things happen.

OK pending tests?
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