Fix minified output for FunctionThatReturnsNull.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

 // Copyright (c) 2014, 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.
 
 part of dart2js.js_emitter;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 917 matching lines @@
     output.add(N);
   }
 
   void emitFunctionThatReturnsNull(CodeOutput output) {
     output.addBuffer(
         jsAst.prettyPrint(
             js.statement('#.# = function() {}',
                          [backend.namer.isolateName,
                           backend.rti.getFunctionThatReturnsNullName]),
             compiler, monitor: compiler.dumpInfoTask));
+    output.add(N);

[sigurdm, 2015/01/20 10:36:16]

I guess you could chose to only output this in minified mode
But it doesn't matter much.

   }
 
   jsAst.Expression generateFunctionThatReturnsNull() {
     return js("#.#", [backend.namer.isolateName,
                       backend.rti.getFunctionThatReturnsNullName]);
   }
 
   /// Returns the code equivalent to:
   ///   `function(args) { $.startRootIsolate(X.main$closure(), args); }`
   jsAst.Expression buildIsolateSetupClosure(Element appMain,
@@ skipping 1146 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }