re PR ipa/60761 (Improve dump_decl for clones)

	PR ipa/60761
	* error.c (dump_decl) <case FUNCTION_DECL>: If
	DECL_LANG_SPECIFIC is NULL, but DECL_ABSTRACT_ORIGIN is not,
	recurse on DECL_ABSTRACT_ORIGIN instead of printing
	<built-in>.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r209278