Add Array support for @@species and subclassing

src/runtime/runtime-array.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 "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/elements.h"
 #include "src/factory.h"
@@ skipping 469 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_FastOneByteArrayJoin) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   // Returning undefined means that this fast path fails and one has to resort
   // to a slow path.
   return isolate->heap()->undefined_value();
 }
+
+
+RUNTIME_FUNCTION(Runtime_ArraySpeciesConstructor) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, original_array, 0);
+  Handle<Object> constructor;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, constructor,
+      Object::ArraySpeciesConstructor(isolate, original_array));
+  return *constructor;
+}
+
 }  // namespace internal
 }  // namespace v8