[runtime] Add DescriptorArray::GeneralizeAllFields().

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index bf51b3640b04e31d3af7e7d452cc1034f93bf6ac..65f12cadfb318271696cc9c192ecfee5a0a0e7db 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -3075,15 +3075,6 @@ void DescriptorArray::SetSortedKey(int descriptor_index, int pointer) {
 }
 
 
-void DescriptorArray::SetRepresentation(int descriptor_index,
-                                        Representation representation) {
-  DCHECK(!representation.IsNone());
-  PropertyDetails details = GetDetails(descriptor_index);
-  set(ToDetailsIndex(descriptor_index),
-      details.CopyWithRepresentation(representation).AsSmi());
-}
-
-
 Object** DescriptorArray::GetValueSlot(int descriptor_number) {
   DCHECK(descriptor_number < number_of_descriptors());
   return RawFieldOfElementAt(ToValueIndex(descriptor_number));