Use map to distinguish type feedback vectors.

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 331 matching lines @@
 bool HeapObject::IsFrameArray() const { return IsFixedArray(); }
 
 bool HeapObject::IsArrayList() const { return IsFixedArray(); }
 
 bool HeapObject::IsRegExpMatchInfo() const { return IsFixedArray(); }
 
 bool Object::IsLayoutDescriptor() const {
   return IsSmi() || IsFixedTypedArrayBase();
 }
 
-bool HeapObject::IsTypeFeedbackVector() const { return IsFixedArray(); }
+bool HeapObject::IsTypeFeedbackVector() const {
+  return map() == GetHeap()->type_feedback_vector_map();
+}
 
 bool HeapObject::IsTypeFeedbackMetadata() const { return IsFixedArray(); }
 
 bool HeapObject::IsLiteralsArray() const { return IsFixedArray(); }
 
 bool HeapObject::IsDeoptimizationInputData() const {
   // Must be a fixed array.
   if (!IsFixedArray()) return false;
 
   // There's no sure way to detect the difference between a fixed array and
@@ skipping 8088 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_