Fix for issue 27199

pkg/compiler/lib/src/ssa/nodes.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.
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../dart_types.dart';
@@ skipping 3221 matching lines @@
   accept(HVisitor visitor) => visitor.visitTypeInfoReadVariable(this);
 
   bool canThrow() => false;
 
   int typeCode() => HInstruction.TYPE_INFO_READ_VARIABLE_TYPECODE;
   bool typeEquals(HInstruction other) => other is HTypeInfoReadVariable;
 
   bool dataEquals(HTypeInfoReadVariable other) {
     return variable.element == other.variable.element;
   }
+
+  String toString() => 'HTypeInfoReadVariable($variable)';
 }
 
 enum TypeInfoExpressionKind { COMPLETE, INSTANCE }
 
 /// Constructs a representation of a closed or ground-term type (that is, a type
 /// without type variables).
 ///
 /// There are two forms:
 ///
 /// - COMPLETE: A complete form that is self contained, used for the values of
@@ skipping 169 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }