[runtime][ic] Constant field tracking support.

src/map-updater.h

Index: src/map-updater.h
diff --git a/src/map-updater.h b/src/map-updater.h
index 39e432dd03f07316d8f5ba74faa2ff84532e3f23..338914448f88764a98ca414ba29e9986d75d2875 100644
--- a/src/map-updater.h
+++ b/src/map-updater.h
@@ -55,6 +55,7 @@ class MapUpdater {
   // performs the steps 1-5.
   Handle<Map> ReconfigureToDataField(int descriptor,
                                      PropertyAttributes attributes,
+                                     PropertyConstness constness,
                                      Representation representation,
                                      Handle<FieldType> field_type);
 
@@ -141,6 +142,11 @@ class MapUpdater {
       Handle<DescriptorArray> descriptors, int descriptor,
       PropertyLocation location, Representation representation);
 
+  void GeneralizeField(Handle<Map> map, int modify_index,
+                       PropertyConstness new_constness,
+                       Representation new_representation,
+                       Handle<FieldType> new_field_type);
+
   Isolate* isolate_;
   Handle<Map> old_map_;
   Handle<DescriptorArray> old_descriptors_;