Address review comments of previously submitted cl 8329005.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
===================================================================
--- runtime/vm/code_generator.cc	(revision 522)
+++ runtime/vm/code_generator.cc	(working copy)
@@ -149,8 +149,7 @@
   const Class& cls = Class::CheckedHandle(arguments.At(0));
   const Instance& instance = Instance::Handle(Instance::New(cls));
   arguments.SetReturn(instance);
-  const intptr_t num_type_arguments = cls.NumTypeArguments();
-  if (num_type_arguments > 0) {
+  if (!cls.HasTypeArguments()) {
     // No type arguments required for a non-parameterized type.
     ASSERT(Instance::CheckedHandle(arguments.At(1)).IsNull());
     return;
@@ -161,7 +160,7 @@
     ASSERT(Instance::CheckedHandle(arguments.At(2)).IsNull());
     return;
   }
-  ASSERT(type_arguments.Length() == num_type_arguments);
+  ASSERT(type_arguments.Length() == cls.NumTypeArguments());
   const TypeArguments& instantiator =
       TypeArguments::CheckedHandle(arguments.At(2));
   if (instantiator.IsNull()) {