Add inference test functionality based on code point id.

pkg/compiler/lib/src/inferrer/builder.dart

 // 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.
 
 library simple_types_inferrer;
 
 import '../closure.dart' show ClosureClassMap;
 import '../common.dart';
 import '../common/names.dart' show Identifiers, Selectors;
 import '../compiler.dart' show Compiler;
@@ skipping 2868 matching lines @@
 
     if (node.expression.isThis()) {
       // Any reasonable implementation of an iterator would expose
       // this, so we play it safe and assume it will.
       isThisExposed = true;
     }
 
     ast.Node identifier = node.declaredIdentifier;
     Element element = elements.getForInVariable(node);
     Selector selector = elements.getSelector(identifier);
-    TypeMask mask = inTreeData.typeOfSend(identifier);
+    TypeMask mask = inTreeData.typeOfSend(identifier.asSend());
 
     TypeInformation receiverType;
     if (element != null && element.isInstanceMember) {
       receiverType = thisType;
     } else {
       receiverType = types.dynamicType;
     }
 
     handlePlainAssignment(identifier, element, selector, mask, receiverType,
         currentType, node.expression);
@@ skipping 30 matching lines @@
     Selector moveNextSelector = Selectors.moveNext;
     TypeMask moveNextMask = inTreeData.typeOfIteratorMoveNext(node);
 
     TypeInformation iteratorType = handleDynamicSend(node, iteratorSelector,
         iteratorMask, expressionType, new ArgumentsTypes.empty());
 
     return handleForInLoop(node, iteratorType, currentSelector, currentMask,
         moveNextSelector, moveNextMask);
   }
 }