Properly handle instantiator when allocating or cloning closure instance.

runtime/vm/object_test.cc

Index: runtime/vm/object_test.cc
diff --git a/runtime/vm/object_test.cc b/runtime/vm/object_test.cc
index 0e7ba6c14611c07573440007dd79921b541161ab..fdaff296d8042799c93fac5c004a9d339ef4a007 100644
--- a/runtime/vm/object_test.cc
+++ b/runtime/vm/object_test.cc
@@ -2619,7 +2619,8 @@ ISOLATE_UNIT_TEST_CASE(Closure) {
   const String& function_name = String::Handle(Symbols::New(thread, "foo"));
   function = Function::NewClosureFunction(function_name, parent,
                                           TokenPosition::kMinSource);
-  const Closure& closure = Closure::Handle(Closure::New(function, context));
+  const Closure& closure =
+      Closure::Handle(Closure::New(TypeArguments::Handle(), function, context));
   const Class& closure_class = Class::Handle(closure.clazz());
   EXPECT_EQ(closure_class.id(), kClosureCid);
   const Function& closure_function = Function::Handle(closure.function());