- Avoid deep recursions when executing type tests.

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 29871)
+++ runtime/vm/object.h	(working copy)
@@ -1131,6 +1131,14 @@
                 const AbstractTypeArguments& other_type_arguments,
                 Error* bound_error) const;
 
+  static bool TypeTestNonRecursive(
+      const Class& cls,
+      TypeTestKind test_kind,
+      const AbstractTypeArguments& type_arguments,
+      const Class& other,
+      const AbstractTypeArguments& other_type_arguments,
+      Error* bound_error);
+
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Class, Object);
   friend class AbstractType;
   friend class Instance;