Add inference test functionality based on code point id.

pkg/compiler/lib/src/types/types.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.
 
 library types;
 
 import '../closure.dart' show SynthesizedCallMethodElementX;
 import '../common.dart' show invariant;
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
@@ skipping 110 matching lines @@
 /// a single element.
 class GlobalTypeInferenceElementData {
   Map<Object, TypeMask> _typeMasks;
 
   TypeMask _get(Object node) => _typeMasks != null ? _typeMasks[node] : null;
   void _set(Object node, TypeMask mask) {
     _typeMasks ??= new Maplet<Object, TypeMask>();
     _typeMasks[node] = mask;
   }
 
-  TypeMask typeOfSend(Node node) => _get(node);
+  TypeMask typeOfSend(Send node) => _get(node);
   TypeMask typeOfGetter(SendSet node) => _get(node.selector);
   TypeMask typeOfOperator(SendSet node) => _get(node.assignmentOperator);
 
-  void setTypeMask(Node node, TypeMask mask) {
+  void setTypeMask(Send node, TypeMask mask) {
     _set(node, mask);
   }
 
   void setGetterTypeMaskInComplexSendSet(SendSet node, TypeMask mask) {
     _set(node.selector, mask);
   }
 
   void setOperatorTypeMaskInComplexSendSet(SendSet node, TypeMask mask) {
     _set(node.assignmentOperator, mask);
   }
@@ skipping 111 matching lines @@
     measure(() {
       typesInferrerInternal ??=
           new TypeGraphInferrer(compiler, closedWorld, closedWorldRefiner);
       typesInferrerInternal.analyzeMain(mainElement);
       typesInferrerInternal.clear();
       results = new GlobalTypeInferenceResults(typesInferrerInternal, compiler,
           closedWorld, typesInferrerInternal.inferrer.types);
     });
   }
 }