[turbofan] Port initialization of new.target variable.

src/runtime/runtime-function.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/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/cpu-profiler.h"
@@ skipping 583 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_GetConstructorDelegate) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   RUNTIME_ASSERT(!object->IsJSFunction());
   return *Execution::GetConstructorDelegate(isolate, object);
 }
 
 
+RUNTIME_FUNCTION(Runtime_GetOriginalConstructor) {
+  SealHandleScope shs(isolate);
+  DCHECK(args.length() == 0);
+  JavaScriptFrameIterator it(isolate);
+  JavaScriptFrame* frame = it.frame();
+  return frame->IsConstructor() ? frame->GetOriginalConstructor()
+                                : isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(Runtime_CallFunction) {
   SealHandleScope shs(isolate);
   return __RT_impl_Runtime_Call(args, isolate);
 }
 
 
 RUNTIME_FUNCTION(Runtime_IsConstructCall) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   JavaScriptFrameIterator it(isolate);
@@ skipping 11 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_ThrowStrongModeTooFewArguments) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   THROW_NEW_ERROR_RETURN_FAILURE(isolate,
                                  NewTypeError(MessageTemplate::kStrongArity));
 }
 }  // namespace internal
 }  // namespace v8