[runtime] Use PropertyKind/PropertyLocation instead of PropertyType.

src/value-serializer.cc

Index: src/value-serializer.cc
diff --git a/src/value-serializer.cc b/src/value-serializer.cc
index 0452c9b6e59d764ea7a463324a1ddbd86fb2b5e2..955e73cfbfe3405d1743b9be6e1b637211c254ef 100644
--- a/src/value-serializer.cc
+++ b/src/value-serializer.cc
@@ -475,7 +475,8 @@ Maybe<bool> ValueSerializer::WriteJSObject(Handle<JSObject> object) {
 
     Handle<Object> value;
     if (V8_LIKELY(!map_changed)) map_changed = *map == object->map();
-    if (V8_LIKELY(!map_changed && details.type() == DATA)) {
+    if (V8_LIKELY(!map_changed && details.location() == kField)) {
+      DCHECK_EQ(kData, details.kind());
       FieldIndex field_index = FieldIndex::ForDescriptor(*map, i);
       value = JSObject::FastPropertyAt(object, details.representation(),
                                        field_index);