Reland r26549 "Fix IsWeakObjectInOptimizedCode predicate to also include property cells."

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 75e5ae39b8ca7f7f8a1e0662326f067865f90b99..383bc76a25018f1844afe76e9394c3dac1844b01 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5242,7 +5242,11 @@ bool Code::IsWeakObjectInOptimizedCode(Object* object) {
     return Map::cast(object)->CanTransition() &&
            FLAG_weak_embedded_maps_in_optimized_code;
   }
-  if (object->IsCell()) object = Cell::cast(object)->value();
+  if (object->IsCell()) {
+    object = Cell::cast(object)->value();
+  } else if (object->IsPropertyCell()) {
+    object = PropertyCell::cast(object)->value();
+  }
   if (object->IsJSObject()) {
     return FLAG_weak_embedded_objects_in_optimized_code;
   }