Cleanup change.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 332 matching lines @@
     // Fallthrough.
     return true;
   }
   const Class& type_class = Class::Handle(zone(), type.type_class());
   ASSERT(type_class.NumTypeArguments() == 0);
 
   const Register kInstanceReg = RAX;
   __ testq(kInstanceReg, Immediate(kSmiTagMask));
   // If instance is Smi, check directly.
   const Class& smi_class = Class::Handle(zone(), Smi::Class());
-  if (smi_class.IsSubtypeOf(TypeArguments::Handle(zone()), type_class,
-                            TypeArguments::Handle(zone()), NULL, NULL,
+  if (smi_class.IsSubtypeOf(Object::null_type_arguments(), type_class,
+                            Object::null_type_arguments(), NULL, NULL,
                             Heap::kOld)) {
     __ j(ZERO, is_instance_lbl);
   } else {
     __ j(ZERO, is_not_instance_lbl);
   }
   const Register kClassIdReg = R10;
   __ LoadClassId(kClassIdReg, kInstanceReg);
   // See ClassFinalizer::ResolveSuperTypeAndInterfaces for list of restricted
   // interfaces.
   // Bool interface can be implemented only by core class Bool.
@@ skipping 1398 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64