Don't call FastNewFunctionContextStub if context is bigger than kMaxRegularHeapObjectSize.

test/mjsunit/regress/regress-655573.js

Index: test/mjsunit/regress/regress-655573.js
diff --git a/test/mjsunit/regress/regress-655573.js b/test/mjsunit/regress/regress-655573.js
new file mode 100644
index 0000000000000000000000000000000000000000..31f8ffe32d04a3b4140d4c1383f7b8c4c3cf057f
--- /dev/null
+++ b/test/mjsunit/regress/regress-655573.js
@@ -0,0 +1,16 @@
+// 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.
+
+// Generate a function with a very large closure.
+source = "(function() {\n"
+for (var i = 0; i < 65000; i++) {
+  source += "  var a_" + i + " = 0;\n";
+}
+source += "  return function() {\n"
+for (var i = 0; i < 65000; i++) {
+  source += "a_" + i + "++;\n";
+}
+source += "}})();\n"
+
+eval(source);