vm_insnhelper.c: update assertion [ci skip]

* vm_insnhelper.c (callable_class_p): update assertion as callable
  class may be T_MODULE or I_ICLASS which refines a module since
  r56213.  [Feature #12534]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56381 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_insnhelper.c

@@ -40,6 +40,13 @@ static int
 callable_class_p(VALUE klass)
 {
 #if VM_CHECK_MODE >= 2
+    if (!klass) return FALSE;
+    switch (RB_BUILTIN_TYPE(klass)) {
+      case T_ICLASS:
+	if (!RB_TYPE_P(RCLASS_SUPER(klass), T_MODULE)) break;
+      case T_MODULE:
+	return TRUE;
+    }
     while (klass) {
 	if (klass == rb_cBasicObject) {
 	    return TRUE;