[runtime][ic] Constant field tracking support.

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 5f7a293e36fdf5ecf55bb3e192509bfd7ad8da17..7d8838bac39ebea8cbdf278b56347b868543537a 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -214,6 +214,10 @@ class V8_EXPORT_PRIVATE LookupIterator final BASE_EMBEDDED {
            (!transition_map()->is_dictionary_map() &&
             transition_map()->GetBackPointer()->IsMap());
   }
+  bool IsInitializingStoreRequired() {
+    DCHECK(IsFound());
+    return !IsElement() && !is_dictionary_holder() && representation().IsNone();
+  }
   void ApplyTransitionToDataProperty(Handle<JSObject> receiver);
   void ReconfigureDataProperty(Handle<Object> value,
                                PropertyAttributes attributes);
@@ -236,6 +240,7 @@ class V8_EXPORT_PRIVATE LookupIterator final BASE_EMBEDDED {
   Representation representation() const {
     return property_details().representation();
   }
+  PropertyConstness constness() const { return property_details().constness(); }
   FieldIndex GetFieldIndex() const;
   Handle<FieldType> GetFieldType() const;
   int GetFieldDescriptorIndex() const;
@@ -252,7 +257,7 @@ class V8_EXPORT_PRIVATE LookupIterator final BASE_EMBEDDED {
   }
   Handle<InterceptorInfo> GetInterceptorForFailedAccessCheck() const;
   Handle<Object> GetDataValue() const;
-  void WriteDataValue(Handle<Object> value);
+  void WriteDataValue(Handle<Object> value, bool initializing_store);
   inline void UpdateProtector() {
     if (IsElement()) return;
     if (*name_ == heap()->is_concat_spreadable_symbol() ||
@@ -303,6 +308,7 @@ class V8_EXPORT_PRIVATE LookupIterator final BASE_EMBEDDED {
   template <bool is_element>
   void RestartInternal(InterceptorState interceptor_state);
   Handle<Object> FetchValue() const;
+  bool IsConstFieldValueEqualTo(Object* value) const;
   template <bool is_element>
   void ReloadPropertyInformation();