[stubs] Unify (and optimize) implementation of ToObject.

src/collection.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var $getHash;
 var $getExistingHash;
 var $mapSet;
 var $mapHas;
 var $mapDelete;
 var $setAdd;
@@ skipping 250 matching lines @@
     needs_wrapper = SHOULD_CREATE_WRAPPER(f, receiver);
   }
 
   var iterator = new SetIterator(this, ITERATOR_KIND_VALUES);
   var key;
   var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
   var value_array = [UNDEFINED];
   while (%SetIteratorNext(iterator, value_array)) {
     if (stepping) %DebugPrepareStepInIfStepping(f);
     key = value_array[0];
-    var new_receiver = needs_wrapper ? $toObject(receiver) : receiver;
+    var new_receiver = needs_wrapper ? TO_OBJECT(receiver) : receiver;
     %_CallFunction(new_receiver, key, key, this, f);
   }
 }
 
 // -------------------------------------------------------------------
 
 %SetCode(GlobalSet, SetConstructor);
 %FunctionSetLength(GlobalSet, 0);
 %FunctionSetPrototype(GlobalSet, new GlobalObject());
 %AddNamedProperty(GlobalSet.prototype, "constructor", GlobalSet, DONT_ENUM);
@@ skipping 168 matching lines @@
     if (%IsSloppyModeFunction(f)) receiver = UNDEFINED;
   } else if (!IS_UNDEFINED(receiver)) {
     needs_wrapper = SHOULD_CREATE_WRAPPER(f, receiver);
   }
 
   var iterator = new MapIterator(this, ITERATOR_KIND_ENTRIES);
   var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
   var value_array = [UNDEFINED, UNDEFINED];
   while (%MapIteratorNext(iterator, value_array)) {
     if (stepping) %DebugPrepareStepInIfStepping(f);
-    var new_receiver = needs_wrapper ? $toObject(receiver) : receiver;
+    var new_receiver = needs_wrapper ? TO_OBJECT(receiver) : receiver;
     %_CallFunction(new_receiver, value_array[1], value_array[0], this, f);
   }
 }
 
 // -------------------------------------------------------------------
 
 %SetCode(GlobalMap, MapConstructor);
 %FunctionSetLength(GlobalMap, 0);
 %FunctionSetPrototype(GlobalMap, new GlobalObject());
 %AddNamedProperty(GlobalMap.prototype, "constructor", GlobalMap, DONT_ENUM);
@@ skipping 38 matching lines @@
 $setFromArray = function(array) {
   var set = new GlobalSet;
   var length = array.length;
   for (var i = 0; i < length; ++i) {
     %_CallFunction(set, array[i], SetAdd);
   }
   return set;
 };
 
 })