Handle accessors on the prototype chain in StoreICs.

test/mjsunit/accessor-map-sharing.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 17 matching lines @@
 // Flags: --allow-natives-syntax
 
 // Handy abbreviations.
 var dp = Object.defineProperty;
 var gop = Object.getOwnPropertyDescriptor;
 
 function getter() { return 111; }
 function setter(x) { print(222); }
 function anotherGetter() { return 333; }
 function anotherSetter(x) { print(444); }
-var obj1, obj2;
+var obj1, obj2, obj3, obj4;
 
 // Two objects with the same getter.
 obj1 = {};
 dp(obj1, "alpha", { get: getter });
 obj2 = {};
 dp(obj2, "alpha", { get: getter });
 assertTrue(%HaveSameMap(obj1, obj2));
 
 // Two objects with the same getter, oldskool.
 obj1 = {};
@@ skipping 118 matching lines @@
 assertEquals(setter, gop(obj1, "oscar").set);
 
 // Re-adding the same getter/attributes pair.
 obj1 = {};
 dp(obj1, "papa", { get: getter, configurable: true });
 dp(obj1, "papa", { get: getter, set: setter, configurable: true });
 assertEquals(getter, gop(obj1, "papa").get);
 assertEquals(setter, gop(obj1, "papa").set);
 assertTrue(gop(obj1, "papa").configurable);
 assertFalse(gop(obj1, "papa").enumerable);
+
+// Two objects with the same getter on the prototype chain.
+obj1 = {};
+dp(obj1, "quebec", { get: getter });
+obj2 = Object.create(obj1);
+obj3 = Object.create(obj2);
+obj4 = Object.create(obj2);
+assertTrue(%HaveSameMap(obj3, obj4));
+
+// Two objects with the same setter on the prototype chain.
+obj1 = {};
+dp(obj1, "romeo", { set: setter });
+obj2 = Object.create(obj1);
+obj3 = Object.create(obj2);
+obj4 = Object.create(obj2);
+assertTrue(%HaveSameMap(obj3, obj4));