Fix SealHandleScope usage in runtime-classes.cc

test/mjsunit/regress/regress-5783.js

Index: test/mjsunit/regress/regress-5783.js
diff --git a/test/message/function-sent-escaped.js b/test/mjsunit/regress/regress-5783.js
similarity index 55%
copy from test/message/function-sent-escaped.js
copy to test/mjsunit/regress/regress-5783.js
index aa17258f854a96a65617feb572389464677a81ce..828bb3dc56f1e1d609f5178f5f1e3b97db97510b 100644
--- a/test/message/function-sent-escaped.js
+++ b/test/mjsunit/regress/regress-5783.js
@@ -1,10 +1,8 @@
 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-//
-// Flags: --harmony-function-sent
 
-function* f() {
-  return function.s\u0065nt;
-}
-for (var i of f()) print(i);
+class C {}
+class D extends C { constructor(...args) { super(...args, 75) } }
+D.__proto__ = null;
+assertThrows(() => new D(), TypeError);