Inline some more compare operations.

test/mjsunit/compare-known-objects.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 32 matching lines @@
   // Check CompareIC for equality of known objects.
   assertTrue(eq(a, a));
   assertTrue(eq(b, b));
   assertFalse(eq(a, b));
   // Check CompareIC for strict equality of known objects.
   assertTrue(eq_strict(a, a));
   assertTrue(eq_strict(b, b));
   assertFalse(eq_strict(a, b));
 }
 
-// Prepare two objects in slow mode that have the same map.
-var obj1 = %OptimizeObjectForAddingMultipleProperties({}, 1);
-var obj2 = %OptimizeObjectForAddingMultipleProperties({}, 1);
+function O(){};
+O.prototype.t = function() {}
+
+var obj1 = new O;
+var obj2 = new O;
 
 // Test original objects.
 assertTrue(%HaveSameMap(obj1, obj2));
 test(obj1, obj2);
 
 // Test after adding property to first object.
 obj1.x = 1;
-assertTrue(%HaveSameMap(obj1, obj2));
 test(obj1, obj2);
-
-// Test after adding property to second object.
-obj2.y = 2;
-assertTrue(%HaveSameMap(obj1, obj2));
-test(obj1, obj2);