Support factory methods.

frog/leg/compiler.dart

 // Copyright (c) 2011, 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.
 
 class WorkElement {
   final Element element;
   TreeElements resolutionTree;
   Function run;
 
   WorkElement.toCompile(this.element) : resolutionTree = null {
@@ skipping 154 matching lines @@
   }
 
   String compileMethod(WorkElement work) {
     String code = universe.generatedCode[work.element];
     if (code !== null) return code;
     analyzeMethod(work);
     return codegenMethod(work);
   }
 
   void addToWorklist(Element element) {
-    if (element.kind === ElementKind.CONSTRUCTOR) {
+    if (element.kind === ElementKind.GENERATIVE_CONSTRUCTOR) {
       registerInstantiatedClass(element.enclosingElement);
     }
     worklist.add(new WorkElement.toCompile(element));
   }
 
   void registerStaticInvocation(Element element) {
     addToWorklist(element);
   }
 
   void registerDynamicInvocation(String methodName) {
@@ skipping 53 matching lines @@
 
 class CompilerCancelledException {
   final String reason;
   CompilerCancelledException(this.reason);
 
   String toString() {
     String banner = 'compiler cancelled';
     return (reason !== null) ? '$banner: $reason' : '$banner';
   }
 }