[runtime] Add DescriptorArray::GeneralizeAllFields().

src/map-updater.h

Index: src/map-updater.h
diff --git a/src/map-updater.h b/src/map-updater.h
index 9b192f2c6d34a829b756aacd6e94f8aa0b00b2c5..68b720365b1e86aa741b3e17a5658f9ea3b598f4 100644
--- a/src/map-updater.h
+++ b/src/map-updater.h
@@ -108,7 +108,7 @@ class MapUpdater {
   // When a requested reconfiguration can not be done the result is a copy
   // of |old_map_| where every field has |Tagged| representation and |Any|
   // field type. This map is disconnected from the transition tree.
-  State CopyGeneralizeAllRepresentations(const char* reason);
+  State CopyGeneralizeAllFields(const char* reason);
 
   // Returns name of a |descriptor| property.
   inline Name* GetKey(int descriptor) const;