Cleanup change.

runtime/vm/constant_propagator.cc

Index: runtime/vm/constant_propagator.cc
diff --git a/runtime/vm/constant_propagator.cc b/runtime/vm/constant_propagator.cc
index a147466267323efa4505354f13cb7b5e16fd255f..95bc646a8e76ce2d03fd7c725300ba6361005d40 100644
--- a/runtime/vm/constant_propagator.cc
+++ b/runtime/vm/constant_propagator.cc
@@ -764,10 +764,9 @@ void ConstantPropagator::VisitInstanceOf(InstanceOfInstr* instr) {
       const Instance& instance = Instance::Cast(value);
       const AbstractType& checked_type = instr->type();
       if (instr->instantiator_type_arguments()->BindsToConstantNull()) {
-        const TypeArguments& checked_type_arguments = TypeArguments::Handle();
         Error& bound_error = Error::Handle();
         bool is_instance = instance.IsInstanceOf(
-            checked_type, checked_type_arguments, &bound_error);
+            checked_type, Object::null_type_arguments(), &bound_error);
         // Can only have bound error with generics.
         ASSERT(bound_error.IsNull());
         SetValue(instr, Bool::Get(is_instance));