Change use to type-based pool allocator in

Change use to type-based pool allocator in

	* var-tracking.c (variable_htab_free):Use new type-based pool allocator.
	(attrs_list_clear) Likewise.
	(attrs_list_insert) Likewise.
	(attrs_list_copy) Likewise.
	(shared_hash_unshare) Likewise.
	(shared_hash_destroy) Likewise.
	(unshare_variable) Likewise.
	(var_reg_delete_and_set) Likewise.
	(var_reg_delete) Likewise.
	(var_regno_delete) Likewise.
	(drop_overlapping_mem_locs) Likewise.
	(variable_union) Likewise.
	(insert_into_intersection) Likewise.
	(canonicalize_values_star) Likewise.
	(variable_merge_over_cur) Likewise.
	(dataflow_set_merge) Likewise.
	(remove_duplicate_values) Likewise.
	(variable_post_merge_new_vals) Likewise.
	(dataflow_set_preserve_mem_locs) Likewise.
	(dataflow_set_remove_mem_locs) Likewise.
	(variable_from_dropped) Likewise.
	(variable_was_changed) Likewise.
	(set_slot_part) Likewise.
	(clobber_slot_part) Likewise.
	(delete_slot_part) Likewise.
	(loc_exp_insert_dep) Likewise.
	(notify_dependents_of_changed_value) Likewise.
	(emit_notes_for_differences_1) Likewise.
	(vt_emit_notes) Likewise.
	(vt_initialize) Likewise.
	(vt_finalize) Likewise.

From-SVN: r223947