Use stack frame marker constants to mark arguments adaptor frame.

src/frames-inl.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 110 matching lines @@
   return Memory::Address_at(ComputePCAddress(fp()));
 }
 
 
 inline Address StandardFrame::ComputePCAddress(Address fp) {
   return fp + StandardFrameConstants::kCallerPCOffset;
 }
 
 
 inline bool StandardFrame::IsArgumentsAdaptorFrame(Address fp) {
-  int context = Memory::int_at(fp + StandardFrameConstants::kContextOffset);
-  return context == ArgumentsAdaptorFrame::SENTINEL;
+  Object* marker =
+      Memory::Object_at(fp + StandardFrameConstants::kContextOffset);
+  return marker == Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR);
 }
 
 
 inline bool StandardFrame::IsConstructFrame(Address fp) {
   Object* marker =
       Memory::Object_at(fp + StandardFrameConstants::kMarkerOffset);
   return marker == Smi::FromInt(CONSTRUCT);
 }
 
 
@@ skipping 62 matching lines @@
 template<typename Iterator>
 void JavaScriptFrameIteratorTemp<Iterator>::Reset() {
   iterator_.Reset();
   if (!done()) Advance();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_