Cache number of type arguments in class object instead of recalculating it.

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 2629 matching lines @@
 // Returns a Boolean constant if all classes in ic_data yield the same type-test
 // result and the type tests do not depend on type arguments. Otherwise return
 // Bool::null().
 RawBool* FlowGraphOptimizer::InstanceOfAsBool(const ICData& ic_data,
                                               const AbstractType& type) const {
   ASSERT(ic_data.num_args_tested() == 1);  // Unary checks only.
   if (!type.IsInstantiated() || type.IsMalformed() || type.IsMalbounded()) {
     return Bool::null();
   }
   const Class& type_class = Class::Handle(type.type_class());
-  if (type_class.HasTypeArguments()) {
+  if (type_class.NumTypeArguments() > 0) {
     // Only raw types can be directly compared, thus disregarding type
     // arguments.
     const AbstractTypeArguments& type_arguments =
         AbstractTypeArguments::Handle(type.arguments());
     const bool is_raw_type = type_arguments.IsNull() ||
         type_arguments.IsRaw(type_arguments.Length());
     if (!is_raw_type) {
       // Unknown result.
       return Bool::null();
     }
   }
   const ClassTable& class_table = *Isolate::Current()->class_table();
   Bool& prev = Bool::Handle();
   Class& cls = Class::Handle();
   for (int i = 0; i < ic_data.NumberOfChecks(); i++) {
     cls = class_table.At(ic_data.GetReceiverClassIdAt(i));
-    if (cls.HasTypeArguments()) return Bool::null();
+    if (cls.NumTypeArguments() > 0) return Bool::null();
     const bool is_subtype = cls.IsSubtypeOf(TypeArguments::Handle(),
                                             type_class,
                                             TypeArguments::Handle(),
                                             NULL);
     if (prev.IsNull()) {
       prev = Bool::Get(is_subtype).raw();
     } else {
       if (is_subtype != prev.value()) return Bool::null();
     }
   }
@@ skipping 4988 matching lines @@
   }
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, alloc->cls(), *fields);
   }
 }
 
 
 }  // namespace dart