[turbofan] Port initialization of new.target variable.

src/frames.cc

 // 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.
 
 #include "src/frames.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 712 matching lines @@
 bool JavaScriptFrame::IsConstructor() const {
   Address fp = caller_fp();
   if (has_adapted_arguments()) {
     // Skip the arguments adaptor frame and look at the real caller.
     fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset);
   }
   return IsConstructFrame(fp);
 }
 
 
+Object* JavaScriptFrame::GetOriginalConstructor() const {
+  Address fp = caller_fp();
+  if (has_adapted_arguments()) {
+    // Skip the arguments adaptor frame and look at the real caller.
+    fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset);
+  }
+  DCHECK(IsConstructFrame(fp));
+  return GetExpression(fp, 2);
+}
+
+
 int JavaScriptFrame::GetArgumentsLength() const {
   // If there is an arguments adaptor frame get the arguments length from it.
   if (has_adapted_arguments()) {
     return Smi::cast(GetExpression(caller_fp(), 0))->value();
   } else {
     return GetNumberOfIncomingArguments();
   }
 }
 
 
@@ skipping 793 matching lines @@
   for (StackFrameIterator it(isolate); !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 }  // namespace internal
 }  // namespace v8