Fix bug in type_variable_handler.

sdk/lib/_internal/compiler/implementation/js_backend/backend.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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 1645 matching lines @@
   ClassElement get mapImplementation => mapLiteralClass;
   ClassElement get constMapImplementation => constMapLiteralClass;
   ClassElement get typeImplementation => typeLiteralClass;
   ClassElement get boolImplementation => jsBoolClass;
   ClassElement get nullImplementation => jsNullClass;
 
   void registerStaticUse(Element element, Enqueuer enqueuer) {
     if (element == disableTreeShakingMarker) {
       compiler.disableTypeInferenceForMirrors = true;
       isTreeShakingDisabled = true;
+      typeVariableHandler.onTreeShakingDisabled(enqueuer);
     } else if (element == preserveNamesMarker) {
       mustPreserveNames = true;
     } else if (element == preserveMetadataMarker) {
       mustRetainMetadata = true;
     }
     customElementsAnalysis.registerStaticUse(element, enqueuer);
   }
 
   /// Called when [:const Symbol(name):] is seen.
   void registerConstSymbol(String name, TreeElements elements) {
@@ skipping 205 matching lines @@
       compiler.log('Retaining metadata.');
 
       compiler.libraries.values.forEach(retainMetadataOf);
       for (Dependency dependency in metadataConstants) {
         registerCompileTimeConstant(
             dependency.constant, dependency.user);
       }
       metadataConstants.clear();
     }
 
-    if (isTreeShakingDisabled) {
-      if (enqueuer.isResolutionQueue) {
-        typeVariableHandler.onResolutionQueueEmpty(enqueuer);
-      } else {
-        typeVariableHandler.onCodegenQueueEmpty();
-      }
-    }
     customElementsAnalysis.onQueueEmpty(enqueuer);
   }
 
   void onElementResolved(Element element, TreeElements elements) {
     LibraryElement library = element.getLibrary();
     if (!library.isPlatformLibrary && !library.canUseNative) return;
     bool hasNoInline = false;
     bool hasNoThrows = false;
     bool hasNoSideEffects = false;
     for (MetadataAnnotation metadata in element.metadata) {
@@ skipping 87 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }