[ic] Support data handlers that represent transitioning stores.

src/ic/handler-configuration-inl.h

Index: src/ic/handler-configuration-inl.h
diff --git a/src/ic/handler-configuration-inl.h b/src/ic/handler-configuration-inl.h
index ca67257abe02ba5afb55309caccfd88ec71b70a1..505d67cf42bac03dc17dbfe7ac6c2f20c2c82535 100644
--- a/src/ic/handler-configuration-inl.h
+++ b/src/ic/handler-configuration-inl.h
@@ -79,9 +79,10 @@ Handle<Object> LoadHandler::LoadElement(Isolate* isolate,
   return handle(Smi::FromInt(config), isolate);
 }
 
-Handle<Object> StoreHandler::StoreField(Isolate* isolate, int descriptor,
-                                        FieldIndex field_index,
-                                        Representation representation) {
+Handle<Object> StoreHandler::StoreField(Isolate* isolate, Kind kind,
+                                        int descriptor, FieldIndex field_index,
+                                        Representation representation,
+                                        bool extend_storage) {
   StoreHandler::FieldRepresentation field_rep;
   switch (representation.kind()) {
     case Representation::kSmi:
@@ -102,7 +103,11 @@ Handle<Object> StoreHandler::StoreField(Isolate* isolate, int descriptor,
   }
   int value_index = DescriptorArray::ToValueIndex(descriptor);
 
-  int config = StoreHandler::KindBits::encode(StoreHandler::kForFields) |
+  DCHECK(kind == kStoreField || kind == kTransitionToField);
+  DCHECK_IMPLIES(kind == kStoreField, !extend_storage);
+
+  int config = StoreHandler::KindBits::encode(kind) |
+               StoreHandler::ExtendStorageBits::encode(extend_storage) |
                StoreHandler::IsInobjectBits::encode(field_index.is_inobject()) |
                StoreHandler::FieldRepresentationBits::encode(field_rep) |
                StoreHandler::DescriptorValueIndexBits::encode(value_index) |
@@ -110,6 +115,30 @@ Handle<Object> StoreHandler::StoreField(Isolate* isolate, int descriptor,
   return handle(Smi::FromInt(config), isolate);
 }
 
+Handle<Object> StoreHandler::StoreField(Isolate* isolate, int descriptor,
+                                        FieldIndex field_index,
+                                        Representation representation) {
+  return StoreField(isolate, kStoreField, descriptor, field_index,
+                    representation, false);
+}
+
+Handle<Object> StoreHandler::TransitionToField(Isolate* isolate, int descriptor,
+                                               FieldIndex field_index,
+                                               Representation representation,
+                                               bool extend_storage) {
+  return StoreField(isolate, kTransitionToField, descriptor, field_index,
+                    representation, extend_storage);
+}
+
+Handle<Object> StoreHandler::TransitionToConstant(Isolate* isolate,
+                                                  int descriptor) {
+  int value_index = DescriptorArray::ToValueIndex(descriptor);
+  int config =
+      StoreHandler::KindBits::encode(StoreHandler::kTransitionToConstant) |
+      StoreHandler::DescriptorValueIndexBits::encode(value_index);
+  return handle(Smi::FromInt(config), isolate);
+}
+
 }  // namespace internal
 }  // namespace v8