[heap] Fix check in AdvancePage

test/mjsunit/regress/regress-620750.js

Index: test/mjsunit/regress/regress-620750.js
diff --git a/test/mjsunit/es6/classes-super.js b/test/mjsunit/regress/regress-620750.js
similarity index 55%
copy from test/mjsunit/es6/classes-super.js
copy to test/mjsunit/regress/regress-620750.js
index 7bdf4ba86c1c44c6915a046e7ad48cf463da2c20..ab8fbd98fc7fbe6c04b19dfbc7952fa8d98e32b4 100644
--- a/test/mjsunit/es6/classes-super.js
+++ b/test/mjsunit/regress/regress-620750.js
@@ -2,14 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-"use strict";
+// Flags: --es-staging
 
-class Test {
-  m() {
-    super.length = 10;
+function push_a_lot(arr) {
+  for (var i = 0; i < 2e4; i++) {
+    arr.push(i);
   }
+  return arr;
 }
 
-var array = [];
-Test.prototype.m.call(array);
-assertEquals(10, array.length);
+__v_13 = push_a_lot([]);