Remove hand-written assembly ArrayPush stubs

src/array.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 450 matching lines @@
 function ArrayPush() {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.push");
 
   var n = TO_UINT32(this.length);
   var m = %_ArgumentsLength();
 
   if (%IsObserved(this))
     return ObservedArrayPush.apply(this, arguments);
 
   for (var i = 0; i < m; i++) {
-    this[i+n] = %_Arguments(i);
+    // Use SetProperty rather than a direct keyed store to ensure that the store
+    // site doesn't become poisened with an elements transition KeyedStoreIC.
+    //
+    // TODO(danno): Using %SetProperty is a temporary workaround. The spec says
+    // that ToObject needs to be called for primitive values (and
+    // Runtime_SetProperty seem to ignore them).
+    %SetProperty(this, i+n, %_Arguments(i), 0, kStrictMode);
   }
 
   var new_length = n + m;
   this.length = new_length;
   return new_length;
 }
 
 
 // Returns an array containing the array elements of the object followed
 // by the array elements of each argument in order. See ECMA-262,
@@ skipping 1139 matching lines @@
   ));
 
   SetUpLockedPrototype(InternalPackedArray, $Array(), $Array(
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush)
   ));
 }
 
 SetUpArray();