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

lib/compiler/implementation/ssa/closure.dart

Index: lib/compiler/implementation/ssa/closure.dart
diff --git a/lib/compiler/implementation/ssa/closure.dart b/lib/compiler/implementation/ssa/closure.dart
index 82ee51afec661305c02f58d0dda510b39cce048d..09e025b3f8b8443de8f881e6a425bd70af186478 100644
--- a/lib/compiler/implementation/ssa/closure.dart
+++ b/lib/compiler/implementation/ssa/closure.dart
@@ -14,7 +14,12 @@ class ClosureFieldElement extends Element {
 
 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);