Remove GetDefaultReceiver, pass in undefined to sloppy-mode functions instead.

src/harmony-typedarray.js

 // Copyright 2014 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.
 
 (function() {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 23 matching lines @@
   if (!IS_SPEC_FUNCTION(f)) throw MakeTypeError(kCalledNonCallable, f);
 
   var length = %_TypedArrayGetLength(this);
   var receiver;
 
   if (%_ArgumentsLength() > 1) {
     receiver = %_Arguments(1);
   }
 
   var needs_wrapper = false;
-  if (IS_NULL_OR_UNDEFINED(receiver)) {
-    receiver = %GetDefaultReceiver(f) || receiver;
-  } else {
+  if (IS_NULL(receiver)) {
+    if (%IsSloppyModeFunction(mapfn)) receiver = UNDEFINED;
+  } else if (!IS_UNDEFINED(receiver)) {
     needs_wrapper = SHOULD_CREATE_WRAPPER(f, receiver);
   }
 
   var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
   for (var i = 0; i < length; i++) {
     var element = this[i];
     // Prepare break slots for debugger step in.
     if (stepping) %DebugPrepareStepInIfStepping(f);
     var new_receiver = needs_wrapper ? ToObject(receiver) : receiver;
     %_CallFunction(new_receiver, TO_OBJECT_INLINE(element), i, this, f);
@@ skipping 23 matching lines @@
 
   // Set up non-enumerable functions on the prototype object.
   InstallFunctions(global.NAME.prototype, DONT_ENUM, [
     "forEach", NAMEForEach
   ]);
 endmacro
 
 TYPED_ARRAYS(EXTEND_TYPED_ARRAY)
 
 })();