Improve the classs cleanup code when using valgrind

vvp/class_type.cc

@@ -387,6 +387,12 @@ class_type::class_type(const string&nam, size_t nprop)
       instance_size_ = 0;
 }
 
+class_type::~class_type()
+{
+      for (size_t idx = 0 ; idx < properties_.size() ; idx += 1)
+	    delete properties_[idx].type;
+}
+
 void class_type::set_property(size_t idx, const string&name, const string&type)
 {
       assert(idx < properties_.size());

vvp/class_type.h

@@ -39,6 +39,7 @@ class class_type : public __vpiHandle {
 
     public:
       explicit class_type(const std::string&nam, size_t nprop);
+      ~class_type();
 
 	// This is the name of the class type.
       inline const std::string&class_name(void) const { return class_name_; }

vvp/vpi_scope.cc

@@ -132,8 +132,8 @@ void root_table_delete(void)
       for (unsigned idx = 0; idx < vpip_root_table_cnt; idx += 1) {
 	    struct __vpiScope *scope = static_cast<__vpiScope *>
 	          (vpip_root_table_ptr[idx]);
-	    delete_sub_scopes(scope);
 	    vthreads_delete(scope);
+	    delete_sub_scopes(scope);
 	    delete scope;
       }
       free(vpip_root_table_ptr);