Revert "Enqueue superclasses instead of supertypes."

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.
 
 library dart2js.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 1159 matching lines @@
         return;
       }
     }
 
     if (analyzeOnly) {
       if (!analyzeAll && !compilationFailed) {
         // No point in reporting unused code when [analyzeAll] is true: all
         // code is artificially used.
         // If compilation failed, it is possible that the error prevents the
         // compiler from analyzing all the code.
-        // TODO(johnniwinther): Reenable this when the reporting is more
-        // precise.
-        //reportUnusedCode();
+        reportUnusedCode();
       }
       return;
     }
     assert(mainFunction != null);
     phase = PHASE_DONE_RESOLVING;
 
     world.populate();
     // Compute whole-program-knowledge that the backend needs. (This might
     // require the information computed in [world.populate].)
     backend.onResolutionComplete();
@@ skipping 641 matching lines @@
 
   @override
   InterfaceType streamType([DartType elementType]) {
     InterfaceType type = streamClass.computeType(compiler);
     if (elementType == null) {
       return streamClass.rawType;
     }
     return type.createInstantiation([elementType]);
   }
 }