Give CodeEmitterTask a name for -v compiles

pkg/compiler/lib/src/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 2105 matching lines @@
 
 class CompilerTask {
   final Compiler compiler;
   final Stopwatch watch;
   UserTag profilerTag;
 
   CompilerTask(Compiler compiler)
       : this.compiler = compiler,
         watch = (compiler.verbose) ? new Stopwatch() : null;
 
-  String get name => 'Unknown task';
+  String get name => "Unknown task '${this.runtimeType}'";
   int get timing => (watch != null) ? watch.elapsedMilliseconds : 0;
 
   int get timingMicroseconds => (watch != null) ? watch.elapsedMicroseconds : 0;
 
   UserTag getProfilerTag() {
     if (profilerTag == null) profilerTag = new UserTag(name);
     return profilerTag;
   }
 
   measure(action()) {
@@ skipping 259 matching lines @@
   InterfaceType get nullType => nullClass.computeType(compiler);
 
   @override
   InterfaceType get numType => numClass.computeType(compiler);
 
   @override
   InterfaceType get stringType =>  stringClass.computeType(compiler);
 }
 
 typedef void InternalErrorFunction(Spannable location, String message);