Move thunks out of cgraph_node

Move thunks out of cgraph_node

this patch moves thunk_info out of cgraph_node into a symbol summary.
I also moved it to separate hearder file since cgraph.h became really too
fat.  I plan to contiue with similar breakup in order to cleanup interfaces
and reduce WPA memory footprint (symbol table now consumes more memory than
trees)

gcc/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

	* Makefile.in: Add symtab-thunks.o
	(GTFILES): Add symtab-thunks.h and symtab-thunks.cc; remove cgraphunit.c
	* cgraph.c: Include symtab-thunks.h.
	(cgraph_node::create_thunk): Update
	(symbol_table::create_edge): Update
	(cgraph_node::dump): Update
	(cgraph_node::call_for_symbol_thunks_and_aliases): Update
	(set_nothrow_flag_1): Update
	(set_malloc_flag_1): Update
	(set_const_flag_1): Update
	(collect_callers_of_node_1): Update
	(clone_of_p): Update
	(cgraph_node::verify_node): Update
	(cgraph_node::function_symbol): Update
	(cgraph_c_finalize): Call thunk_info::release.
	(cgraph_node::has_thunk_p): Update
	(cgraph_node::former_thunk_p): Move here from cgraph.h; reimplement.
	* cgraph.h (struct cgraph_thunk_info): Rename to symtab-thunks.h.
	(cgraph_node): Remove thunk field; add thunk bitfield.
	(cgraph_node::expand_thunk): Move to symtab-thunks.h
	(symtab_thunks_cc_finalize): Declare.
	(cgraph_node::has_gimple_body_p): Update.
	(cgraph_node::former_thunk_p): Update.
	* cgraphclones.c: Include symtab-thunks.h.
	(duplicate_thunk_for_node): Update.
	(cgraph_edge::redirect_callee_duplicating_thunks): Update.
	(cgraph_node::expand_all_artificial_thunks): Update.
	(cgraph_node::create_edge_including_clones): Update.
	* cgraphunit.c: Include symtab-thunks.h.
	(vtable_entry_type): Move to symtab-thunks.c.
	(cgraph_node::analyze): Update.
	(analyze_functions): Update.
	(mark_functions_to_output): Update.
	(thunk_adjust): Move to symtab-thunks.c
	(cgraph_node::expand_thunk): Move to symtab-thunks.c
	(cgraph_node::assemble_thunks_and_aliases): Update.
	(output_in_order): Update.
	(cgraphunit_c_finalize): Do not clear vtable_entry_type.
	(cgraph_node::create_wrapper): Update.
	* gengtype.c (open_base_files): Add symtab-thunks.h
	* ipa-comdats.c (propagate_comdat_group): UPdate.
	(ipa_comdats): Update.
	* ipa-cp.c (determine_versionability): UPdate.
	(gather_caller_stats): Update.
	(count_callers): Update
	(set_single_call_flag): Update
	(initialize_node_lattices): Update
	(call_passes_through_thunk_p): Update
	(call_passes_through_thunk): Update
	(propagate_constants_across_call): Update
	(find_more_scalar_values_for_callers_subset): Update
	(has_undead_caller_from_outside_scc_p): Update
	* ipa-fnsummary.c (evaluate_properties_for_edge): Update.
	(compute_fn_summary): Update.
	(inline_analyze_function): Update.
	* ipa-icf.c: Include symtab-thunks.h.
	(sem_function::equals_wpa): Update.
	(redirect_all_callers): Update.
	(sem_function::init): Update.
	(sem_function::parse): Update.
	* ipa-inline-transform.c: Include symtab-thunks.h.
	(inline_call): Update.
	(save_inline_function_body): Update.
	(preserve_function_body_p): Update.
	* ipa-inline.c (inline_small_functions): Update.
	* ipa-polymorphic-call.c: Include alloc-pool.h, symbol-summary.h,
	symtab-thunks.h
	(ipa_polymorphic_call_context::ipa_polymorphic_call_context): Update.
	* ipa-pure-const.c: Include symtab-thunks.h.
	(analyze_function): Update.
	* ipa-sra.c (check_for_caller_issues): Update.
	* ipa-utils.c (ipa_reverse_postorder): Update.
	(ipa_merge_profiles): Update.
	* ipa-visibility.c (non_local_p): Update.
	(cgraph_node::local_p): Update.
	(function_and_variable_visibility): Update.
	* ipa.c (symbol_table::remove_unreachable_nodes): Update.
	* lto-cgraph.c: Include alloc-pool.h, symbol-summary.h and
	symtab-thunks.h
	(lto_output_edge): Update.
	(lto_output_node): Update.
	(compute_ltrans_boundary): Update.
	(output_symtab): Update.
	(verify_node_partition): Update.
	(input_overwrite_node): Update.
	(input_node): Update.
	* lto-streamer-in.c (fixup_call_stmt_edges): Update.
	* symtab-thunks.cc: New file.
	* symtab-thunks.h: New file.
	* toplev.c (toplev::finalize): Call symtab_thunks_cc_finalize.
	* trans-mem.c (ipa_tm_mayenterirr_function): Update.
	(ipa_tm_execute): Update.
	* tree-inline.c (expand_call_inline): Update.
	* tree-nested.c (create_nesting_tree): Update.
	(convert_all_function_calls): Update.
	(gimplify_all_functions): Update.
	* tree-profile.c (tree_profiling): Update.
	* tree-ssa-structalias.c (associate_varinfo_to_alias): Update.
	* tree.c (free_lang_data_in_decl): Update.
	* value-prof.c (init_node_map): Update.

gcc/c-family/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

	* c-common.c (c_common_finalize_early_debug): Update for new thunk api.

gcc/d/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

	* decl.cc (finish_thunk): Update for new thunk api.

gcc/lto/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

	* lto-partition.c (add_symbol_to_partition_1): Update for new thunk
	api.