Fix test to not teach ClusterFuzz ugly tricks.

test/mjsunit/regress/regress-5902.js

 // Copyright 2017 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: --allow-natives-syntax
 
 var log = [];
 
 function check(predicate, item) {
   if (!predicate) log.push(item);
@@ skipping 13 matching lines @@
   // Skip non-natives.
   if (!obj.toString().includes('native')) return;
 
   // Construct an instance.
   try {
     new obj();
   } catch (e) {
   }
 
   // Check the object.
-  check(% HasFastProperties(obj), `${name}`);
+  check(%HasFastProperties(obj), `${name}`);
 
   // Check the constructor.
   var constructor = obj.constructor;
-  if (! % IsJSReceiver(constructor)) return;
-  check(% HasFastProperties(constructor), `${name}.constructor`);
+  if (!%IsJSReceiver(constructor)) return;
+  check(%HasFastProperties(constructor), `${name}.constructor`);
 
   // Check the prototype.
   var prototype = obj.prototype;
-  if (! % IsJSReceiver(prototype)) return;
-  check(% HasFastProperties(prototype), `${name}.prototype`);
+  if (!%IsJSReceiver(prototype)) return;
+  check(%HasFastProperties(prototype), `${name}.prototype`);
 
   // Check the prototype.constructor.
   var prototype_constructor = prototype.constructor;
-  if (! % IsJSReceiver(prototype_constructor)) return;
+  if (!%IsJSReceiver(prototype_constructor)) return;
   check(
-      % HasFastProperties(prototype_constructor),
+      %HasFastProperties(prototype_constructor),
       `${name}.prototype.constructor`);
 });
 
 // This is the current set of dictionary mode objects.
 // Remove items as we fix them. See issue 5902.
 assertEquals(
     [
       'RegExp', 'RegExp.prototype.constructor', 'Error.prototype',
       'EvalError.prototype', 'RangeError.prototype', 'ReferenceError.prototype',
       'SyntaxError.prototype', 'TypeError.prototype', 'URIError.prototype',
       'Map', 'Map.prototype.constructor', 'Set', 'Set.prototype.constructor'
     ],
     log);