Never call kind_of with klass=0

ext/objspace/objspace.c

@@ -61,14 +61,7 @@ total_i(VALUE v, void *ptr)
 {
     struct total_data *data = (struct total_data *)ptr;
 
-    switch (BUILTIN_TYPE(v)) {
-      case T_NONE:
-      case T_IMEMO:
-      case T_ICLASS:
-      case T_NODE:
-      case T_ZOMBIE:
-          return;
-      default:
+    if (!rb_objspace_internal_object_p(v)) {
           if (data->klass == 0 || rb_obj_is_kind_of(v, data->klass)) {
               data->total += rb_obj_memsize_of(v);
           }

object.c

@@ -791,6 +791,8 @@ rb_obj_is_kind_of(VALUE obj, VALUE c)
 {
     VALUE cl = CLASS_OF(obj);
 
+    RUBY_ASSERT(cl);
+
     // Note: YJIT needs this function to never allocate and never raise when
     // `c` is a class or a module.
     c = class_or_module_required(c);