Reland "Speed up the LookupIterator"

test/mjsunit/lookup-behind-property.js

Index: test/mjsunit/lookup-behind-property.js
diff --git a/test/message/arrow-invalid-rest.js b/test/mjsunit/lookup-behind-property.js
similarity index 70%
copy from test/message/arrow-invalid-rest.js
copy to test/mjsunit/lookup-behind-property.js
index 870dbe9f542ea95050514227feaf9b2299ca516d..abf1a52fbcca4c2b0501168a1519531e675556a7 100644
--- a/test/message/arrow-invalid-rest.js
+++ b/test/mjsunit/lookup-behind-property.js
@@ -1,8 +1,6 @@
 // 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.
-//
-//
 
-var f = (...x = 10) => x;
-f(1, 2, 3, 4, 5);
+var g = Realm.global(Realm.create());
+assertThrows(()=>g.toString());