Bring a fix for v8 bug 589 and Chromium bug 27967 to 1.3....

src/x64/ic-x64.cc

 // Copyright 2009 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 255 matching lines @@
   // Check that the object isn't a smi.
   __ JumpIfSmi(rcx, &slow);
 
   // Check that the object is some kind of JS object EXCEPT JS Value type.
   // In the case that the object is a value-wrapper object,
   // we enter the runtime system to make sure that indexing
   // into string objects work as intended.
   ASSERT(JS_OBJECT_TYPE > JS_VALUE_TYPE);
   __ CmpObjectType(rcx, JS_OBJECT_TYPE, rdx);
   __ j(below, &slow);
-  // Check that the receiver does not require access checks.  We need
-  // to check this explicitly since this generic stub does not perform
-  // map checks.  The map is already in rdx.
+
+  // Check bit field.
   __ testb(FieldOperand(rdx, Map::kBitFieldOffset),
-           Immediate(1 << Map::kIsAccessCheckNeeded));
+           Immediate(kSlowCaseBitFieldMask));
   __ j(not_zero, &slow);
 
   // Check that the key is a smi.
   __ JumpIfNotSmi(rax, &check_string);
   __ SmiToInteger32(rax, rax);
   // Get the elements array of the object.
   __ bind(&index_int);
   __ movq(rcx, FieldOperand(rcx, JSObject::kElementsOffset));
   // Check that the object is in fast mode (not dictionary).
   __ CompareRoot(FieldOperand(rcx, HeapObject::kMapOffset),
@@ skipping 1034 matching lines @@
 
   // Cache miss: Jump to runtime.
   Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal