Sort the output (for now just the classes and instance members).

lib/compiler/implementation/ssa/closure.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.
 
 class ClosureFieldElement extends Element {
   ClosureFieldElement(SourceString name, ClassElement enclosing)
       : super(name, ElementKind.FIELD, enclosing);
 
   bool isInstanceMember() => true;
   bool isAssignable() => false;
 
   String toString() => "ClosureFieldElement($name)";
 }
 
 class ClosureClassElement extends ClassElement {
   ClosureClassElement(Compiler compiler, Element enclosingElement)
-      : super(compiler.closureClass.name, enclosingElement) {
+      : super(compiler.closureClass.name,
+              enclosingElement,
+              // By assigning a fresh class-id we make sure that the hashcode
+              // is unique, but also emit closure class after all other
+              // classes (since the emitter sorts classes by their id).
+              compiler.universe.getNextFreeClassId()) {
     isResolved = true;
     compiler.closureClass.ensureResolved(compiler);
     supertype = compiler.closureClass.computeType(compiler);
   }
 }
 
 class BoxElement extends Element {
   BoxElement(SourceString name, Element enclosingElement)
       : super(name, ElementKind.VARIABLE, enclosingElement);
 }
@@ skipping 396 matching lines @@
     declareLocal(elements[node]);
   }
 
   visitTryStatement(TryStatement node) {
     // TODO(ngeoffray): implement finer grain state.
     inTryCatchOrFinally = true;
     node.visitChildren(this);
     inTryCatchOrFinally = false;
   }
 }