Revert of LayoutDescriptor should inherit from JSTypedArray

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 698 matching lines @@
 
 
 bool Object::IsDescriptorArray() const {
   return IsFixedArray();
 }
 
 
 bool Object::IsArrayList() const { return IsFixedArray(); }
 
 
-bool Object::IsLayoutDescriptor() const { return IsSmi() || IsJSTypedArray(); }
+bool Object::IsLayoutDescriptor() const {
+  return IsSmi() || IsFixedTypedArrayBase();
+}
 
 
 bool Object::IsTransitionArray() const {
   return IsFixedArray();
 }
 
 
 bool Object::IsTypeFeedbackVector() const { return IsFixedArray(); }
 
 
@@ skipping 6808 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_