Simplify runtime type support.

sdk/lib/_internal/compiler/implementation/ssa/optimize.dart

 // Copyright (c) 2012, 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.
 
 part of ssa;
 
 abstract class OptimizationPhase {
   String get name;
   void visitGraph(HGraph graph);
 }
@@ skipping 501 matching lines @@
     } else if (expressionType.isArray()) {
       if (identical(element, compiler.listClass)
           || Elements.isListSupertype(element, compiler)) {
         return graph.addConstantBool(true, constantSystem);
       } else {
         return graph.addConstantBool(false, constantSystem);
       }
     // TODO(karlklose): remove the hasTypeArguments check.
     } else if (expressionType.isUseful()
                && !expressionType.canBeNull()
-               && !backend.rti.hasTypeArguments(type)) {
+               && !RuntimeTypeInformation.hasTypeArguments(type)) {
       DartType receiverType = expressionType.computeType(compiler);
       if (receiverType != null) {
         if (compiler.types.isSubtype(receiverType, type)) {
           return graph.addConstantBool(true, constantSystem);
         } else if (expressionType.isExact()) {
           return graph.addConstantBool(false, constantSystem);
         }
       }
     }
     return node;
@@ skipping 825 matching lines @@
     }
 
     // For other fields having setters in the generative constructor body, set
     // the type to UNKNOWN to avoid relying on the type set in the initializer
     // list.
     allSetters.forEach((Element element) {
       backend.registerFieldConstructor(element, HType.UNKNOWN);
     });
   }
 }