Keep a trail while checking upper bounds in the VM in order to properly handle

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
diff --git a/runtime/vm/flow_graph_builder.cc b/runtime/vm/flow_graph_builder.cc
index b424c603422311172ce1c724bd6a47633c4a08db..7fcd41d45d1f80ead9bb7d5d31ecb93924c66151 100644
--- a/runtime/vm/flow_graph_builder.cc
+++ b/runtime/vm/flow_graph_builder.cc
@@ -1626,7 +1626,7 @@ void EffectGraphVisitor::BuildTypeTest(ComparisonNode* node) {
   // All objects are instances of type T if Object type is a subtype of type T.
   const Type& object_type = Type::Handle(Z, Type::ObjectType());
   if (type.IsInstantiated() &&
-      object_type.IsSubtypeOf(type, NULL, Heap::kOld)) {
+      object_type.IsSubtypeOf(type, NULL, NULL, Heap::kOld)) {
     // Must evaluate left side.
     EffectGraphVisitor for_left_value(owner());
     node->left()->Visit(&for_left_value);