Create optimized versions of the Map/Set clear method

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.
 
 "use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
@@ skipping 74 matching lines @@
   }
   return %_SetGetSize(this);
 }
 
 
 function SetClearJS() {
   if (!IS_SET(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Set.prototype.clear', this]);
   }
-  %SetClear(this);
+  %_SetClear(this);
 }
 
 
 function SetForEach(f, receiver) {
   if (!IS_SET(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Set.prototype.forEach', this]);
   }
 
   if (!IS_SPEC_FUNCTION(f)) {
@@ skipping 132 matching lines @@
   }
   return %_MapGetSize(this);
 }
 
 
 function MapClearJS() {
   if (!IS_MAP(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Map.prototype.clear', this]);
   }
-  %MapClear(this);
+  %_MapClear(this);
 }
 
 
 function MapForEach(f, receiver) {
   if (!IS_MAP(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['Map.prototype.forEach', this]);
   }
 
   if (!IS_SPEC_FUNCTION(f)) {
@@ skipping 36 matching lines @@
     "get", MapGetJS,
     "set", MapSetJS,
     "has", MapHasJS,
     "delete", MapDeleteJS,
     "clear", MapClearJS,
     "forEach", MapForEach
   ));
 }
 
 SetUpMap();