* lto-streamer.c (lto_streamer_cache_insert_1): Accept to override
	other trees that just builtins.
	(lto_record_common_node): Don't leave NULL TYPE_CANONICAL.

lto/
	* lto.c (toplevel): Include tree-flow.h.
	(lto_read_in_decl_state): Don't merge types here.
	(tree_with_vars): New static hash table.
	(remember_with_vars): New static functions.
	(LTO_FIXUP_TYPE): New macro.
	(lto_ft_common, lto_ft_decl_minimal, lto_ft_decl_common,
	lto_ft_decl_with_vis, lto_ft_decl_non_common, lto_ft_function,
	lto_ft_field_decl, lto_ft_type, lto_ft_binfo, lto_ft_constructor,
	lto_ft_expr, lto_fixup_types, uniquify_nodes): New static functions.
	(lto_read_decls): Uniquify while reading in trees.
	(lto_fixup_data_t, LTO_FIXUP_SUBTREE,
	LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE, no_fixup_p, lto_fixup_common,
	lto_fixup_decl_minimal, lto_fixup_decl_common, lto_fixup_decl_with_vis,
	lto_fixup_decl_non_common, lto_fixup_function, lto_fixup_field_decl,
	lto_fixup_type, lto_fixup_binfo, lto_fixup_constructor,
	lto_fixup_tree): Remove.
	(lto_fixup_state): Remove data argument.  Use
	lto_symtab_prevailing_decl.
	(LTO_SET_PREVAIL, LTO_NO_PREVAIL): New macros.
	(lto_fixup_prevailing_decls): New function.
	(lto_fixup_state_aux): Argument aux is unused.
	(lto_fixup_decls): Don't allocate pointer sets, don't use
	lto_fixup_tree, use lto_fixup_prevailing_decls.
	(read_cgraph_and_symbols): Allocate and remove tree_with_vars.
	* Make-lang.in (lto/lto.o): Depend on $(TREE_FLOW_H).

From-SVN: r173155