Make sure we always try to make prototypes fast again when transitioning accessors

src/lookup.cc

Index: src/lookup.cc
diff --git a/src/lookup.cc b/src/lookup.cc
index 3df8752c01a7108ce145875a55d51bdab4185293..7cc2666f964f7eca3f3ad3e4d521ab9f2362b82f 100644
--- a/src/lookup.cc
+++ b/src/lookup.cc
@@ -414,7 +414,10 @@ void LookupIterator::TransitionToAccessorProperty(
     pair = Handle<AccessorPair>::cast(GetAccessors());
     // If the component and attributes are identical, nothing has to be done.
     if (pair->get(component) == *accessor) {
-      if (property_details().attributes() == attributes) return;
+      if (property_details().attributes() == attributes) {
+        if (!IsElement()) JSObject::ReoptimizeIfPrototype(receiver);
+        return;
+      }
     } else {
       pair = AccessorPair::Copy(pair);
       pair->set(component, *accessor);