Don't crash on deserialized type inference.

pkg/compiler/lib/src/inferrer/inferrer_visitor.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 inferrer_visitor;
 
 import 'dart:collection' show IterableMixin;
 
 import '../common.dart';
 import '../compiler.dart' show Compiler;
@@ skipping 723 matching lines @@
       locals.fieldScope.isThisExposed = value;
     }
   }
 
   InferrerVisitor(AstElement analyzedElement, this.resolvedAst, this.inferrer,
       this.types, this.compiler,
       [LocalsHandler<T> handler])
       : this.analyzedElement = analyzedElement,
         this.locals = handler {
     if (handler != null) return;
-    Node node = analyzedElement.node;
+    Node node;
+    if (resolvedAst.kind == ResolvedAstKind.PARSED) {
+      node = resolvedAst.node;
+    }
     FieldInitializationScope<T> fieldScope =
         analyzedElement.isGenerativeConstructor
             ? new FieldInitializationScope<T>(types)
             : null;
     locals = new LocalsHandler<T>(inferrer, types, compiler, node, fieldScope);
   }
 
   DiagnosticReporter get reporter => compiler.reporter;
 
   @override
@@ skipping 729 matching lines @@
     return type;
   }
 
   T visitCascade(Cascade node) {
     // Ignore the result of the cascade send and return the type of the cascade
     // receiver.
     visit(node.expression);
     return cascadeReceiverStack.removeLast();
   }
 }