* lto-symtab.c (lto_cgraph_replace_node): Assert that inline clones has
	no address taken.
	* cgraph.c (cgraph_mark_needed_node): Assert that inline clones are
	never needed.
	(cgraph_clone_node): Clear externally_visible flag for clones.
	* cgraph.h (cgraph_only_called_directly_p,
	cgraph_can_remove_if_no_direct_calls_p): New predicates.
	* tree-pass.h (pass_ipa_whole_program_visibility): Declare.
	* ipa-cp.c (ipcp_cloning_candidate_p): Use new predicate.
	(ipcp_initialize_node_lattices, ipcp_estimate_growth,
	ipcp_insert_stage): Likwise.
	* cgraphunit.c (cgraph_decide_is_function_needed): Do not compute
	externally_visible flag.
	(verify_cgraph_node): Verify that inline clones look right.
	(process_function_and_variable_attributes): Do not set
	externally_visible flags.
	(ipa_passes): Avoid executing small_ipa_passes at LTO stage; they've
	been already run.
	* lto-cgraph.c (lto_output_node): Assert that inline clones are not
	boundaries.
	* ipa-inline.c (cgraph_clone_inlined_nodes): Use new predicates;
	clear externally_visible when turning into inline clones
	(cgraph_mark_inline_edge): Use new predicates.
	(cgraph_estimate_growth): Likewise.
	(cgraph_decide_inlining): Likewise.
	* ipa.c (cgraph_postorder): Likewise.
	(cgraph_remove_unreachable_nodes): Likewise; sanity check
	that inline clones are not needed.
	(cgraph_externally_visible_p): New predicate.
	(function_and_variable_visibility): Add whole_program parameter;
	always set externally_visible flag; handle COMDAT function
	privatization.
	(local_function_and_variable_visibility): New function.
	(gate_whole_program_function_and_variable_visibility): New function.
	(whole_program_function_and_variable_visibility): New function.
	(pass_ipa_whole_program_visibility): New function.
	* passes.c  (init_optimization_passes): Add whole program visibility
	pass.
	(do_per_function_toporder, function_called_by_processed_nodes_p): Do
	not care about needed/reachable flags.
	* varpool.c: Include flags.h
	(decide_is_variable_needed): When doing LTO assume whole-program mode.
	(varpool_finalize_decl): When we are in LTO read-back, all variables
	are analyzed.
	(varpool_analyze_pending_decls): Skip analyzis of analyzed vars.

	* lto/lto.c (read_cgraph_and_symbols): Mark functions neccesary only at
	ltrans stage; explain why this is needed and should not.

From-SVN: r152520