[es6] Partially implement Reflect.setPrototypeOf.

src/runtime/runtime-classes.cc

 // 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.
 
 #include "src/runtime/runtime-utils.h"
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/arguments.h"
@@ skipping 144 matching lines @@
                       Object);
 
   // TODO(arv): Only do this conditionally.
   Handle<Symbol> home_object_symbol(isolate->heap()->home_object_symbol());
   RETURN_ON_EXCEPTION(
       isolate, JSObject::SetOwnPropertyIgnoreAttributes(
                    constructor, home_object_symbol, prototype, DONT_ENUM),
       Object);
 
   if (!constructor_parent.is_null()) {
-    RETURN_ON_EXCEPTION(
-        isolate, JSObject::SetPrototype(constructor, constructor_parent, false),
-        Object);
+    MAYBE_RETURN_NULL(JSObject::SetPrototype(constructor, constructor_parent,
+                                             false, THROW_ON_ERROR));
   }
 
   JSObject::AddProperty(prototype, isolate->factory()->constructor_string(),
                         constructor, DONT_ENUM);
 
   // Install private properties that are used to construct the FunctionToString.
   RETURN_ON_EXCEPTION(
       isolate,
       Object::SetProperty(
           constructor, isolate->factory()->class_start_position_symbol(),
@@ skipping 336 matching lines @@
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
       Execution::New(isolate, super_constructor, original_constructor,
                      argument_count, arguments.get()));
 
   return *result;
 }
 
 }  // namespace internal
 }  // namespace v8