Change StoreIC interface on x64 to pass receiver in rdx, not on stack.

src/x64/codegen-x64.cc

 // Copyright 2010 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 2421 matching lines @@
         if (CompileTimeValue::IsCompileTimeValue(property->value())) break;
         // else fall through.
       case ObjectLiteral::Property::COMPUTED: {
         Handle<Object> key(property->key()->handle());
         if (key->IsSymbol()) {
           // Duplicate the object as the IC receiver.
           frame_->Dup();
           Load(property->value());
           frame_->Push(key);
           Result ignored = frame_->CallStoreIC();
-          // Drop the duplicated receiver and ignore the result.
-          frame_->Drop();
           break;
         }
         // Fall through
       }
       case ObjectLiteral::Property::PROTOTYPE: {
         // Duplicate the object as an argument to the runtime call.
         frame_->Dup();
         Load(property->key());
         Load(property->value());
         Result ignored = frame_->CallRuntime(Runtime::kSetProperty, 3);
@@ skipping 3560 matching lines @@
       cgen_->StoreToSlot(slot, init_state);
       cgen_->UnloadReference(this);
       break;
     }
 
     case NAMED: {
       Comment cmnt(masm, "[ Store to named Property");
       cgen_->frame()->Push(GetName());
       Result answer = cgen_->frame()->CallStoreIC();
       cgen_->frame()->Push(&answer);
-      cgen_->UnloadReference(this);
+      set_unloaded();
       break;
     }
 
     case KEYED: {
       Comment cmnt(masm, "[ Store to keyed Property");
 
       // Generate inlined version of the keyed store if the code is in
       // a loop and the key is likely to be a smi.
       Property* property = expression()->AsProperty();
       ASSERT(property != NULL);
@@ skipping 3172 matching lines @@
   // Call the function from C++.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal