use range based for loops to iterate over vec<>

This changes users of FOR_EACH_VEC_ELT to use range based for loops,
where the index variables are otherwise unused.  As such the index
variables are all deleted, producing shorter and simpler code.

Signed-off-by: Trevor Saunders <tbsaunde@tbsaunde.org>

gcc/analyzer/ChangeLog:

	* call-string.cc (call_string::call_string): Use range based for
	to iterate over vec<>.
	(call_string::to_json): Likewise.
	(call_string::hash): Likewise.
	(call_string::calc_recursion_depth): Likewise.
	* checker-path.cc (checker_path::fixup_locations): Likewise.
	* constraint-manager.cc (equiv_class::equiv_class): Likewise.
	(equiv_class::to_json): Likewise.
	(equiv_class::hash): Likewise.
	(constraint_manager::to_json): Likewise.
	* engine.cc (impl_region_model_context::on_svalue_leak):
	Likewise.
	(on_liveness_change): Likewise.
	(impl_region_model_context::on_unknown_change): Likewise.
	* program-state.cc (sm_state_map::set_state): Likewise.
	* region-model.cc (test_canonicalization_4): Likewise.

gcc/ChangeLog:

	* attribs.c (find_attribute_namespace): Iterate over vec<> with
	range based for.
	* auto-profile.c (afdo_find_equiv_class): Likewise.
	* gcc.c (do_specs_vec): Likewise.
	(do_spec_1): Likewise.
	(driver::set_up_specs): Likewise.
	* gimple-loop-jam.c (any_access_function_variant_p): Likewise.
	* gimple-ssa-store-merging.c (compatible_load_p): Likewise.
	(imm_store_chain_info::try_coalesce_bswap): Likewise.
	(imm_store_chain_info::coalesce_immediate_stores): Likewise.
	(get_location_for_stmts): Likewise.
	* graphite-poly.c (print_iteration_domains): Likewise.
	(free_poly_bb): Likewise.
	(remove_gbbs_in_scop): Likewise.
	(free_scop): Likewise.
	(dump_gbb_cases): Likewise.
	(dump_gbb_conditions): Likewise.
	(print_pdrs): Likewise.
	(print_scop): Likewise.
	* ifcvt.c (cond_move_process_if_block): Likewise.
	* lower-subreg.c (decompose_multiword_subregs): Likewise.
	* regcprop.c (pass_cprop_hardreg::execute): Likewise.
	* sanopt.c (sanitize_rewrite_addressable_params): Likewise.
	* sel-sched-dump.c (dump_insn_vector): Likewise.
	* store-motion.c (store_ops_ok): Likewise.
	(store_killed_in_insn): Likewise.
	* timevar.c (timer::named_items::print): Likewise.
	* tree-cfgcleanup.c (cleanup_control_flow_pre): Likewise.
	(cleanup_tree_cfg_noloop): Likewise.
	* tree-data-ref.c (dump_data_references): Likewise.
	(print_dir_vectors): Likewise.
	(print_dist_vectors): Likewise.
	(dump_data_dependence_relations): Likewise.
	(dump_dist_dir_vectors): Likewise.
	(dump_ddrs): Likewise.
	(create_runtime_alias_checks): Likewise.
	(free_subscripts): Likewise.
	(save_dist_v): Likewise.
	(save_dir_v): Likewise.
	(invariant_access_functions): Likewise.
	(same_access_functions): Likewise.
	(access_functions_are_affine_or_constant_p): Likewise.
	(find_data_references_in_stmt): Likewise.
	(graphite_find_data_references_in_stmt): Likewise.
	(free_dependence_relations): Likewise.
	(free_data_refs): Likewise.
	* tree-inline.c (copy_debug_stmts): Likewise.
	* tree-into-ssa.c (dump_currdefs): Likewise.
	(rewrite_update_phi_arguments): Likewise.
	* tree-ssa-propagate.c (clean_up_loop_closed_phi): Likewise.
	* tree-vect-data-refs.c (vect_analyze_possibly_independent_ddr):
	Likewise.
	(vect_slp_analyze_node_dependences): Likewise.
	(vect_slp_analyze_instance_dependence): Likewise.
	(vect_record_base_alignments): Likewise.
	(vect_get_peeling_costs_all_drs): Likewise.
	(vect_peeling_supportable): Likewise.
	* tree-vectorizer.c (vec_info::~vec_info): Likewise.
	(vec_info::free_stmt_vec_infos): Likewise.

gcc/cp/ChangeLog:

	* constexpr.c (cxx_eval_call_expression): Iterate over vec<>
	with range based for.
	(cxx_eval_store_expression): Likewise.
	(cxx_eval_loop_expr): Likewise.
	* decl.c (wrapup_namespace_globals): Likewise.
	(cp_finish_decl): Likewise.
	(cxx_simulate_enum_decl): Likewise.
	* parser.c (cp_parser_postfix_expression): Likewise.

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