re PR lto/89692 (ICE in streamer_write_chain, at tree-streamer-out.c:506)

re PR lto/89692 (ICE in streamer_write_chain, at tree-streamer-out.c:506)

	PR lto/89692
	* tree.c (fld_type_variant, fld_incomplete_type_of,
	fld_process_array_type): Call fld->pset.add and don't call
	add_tree_to_fld_list if it returns true.
	(free_lang_data_in_type): Similarly with self-recursive call.  Purge
	non-marked types from TYPE_NEXT_VARIANT list.
	(find_decls_types_r): Call fld_worklist_push for TYPE_CANONICAL (t).

	* g++.dg/other/pr89692.C: New test.

From-SVN: r269862