dart2js: Register helpers for updating send to type variable.

pkg/compiler/lib/src/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 1351 matching lines @@
     // defined (that is the enclosing class of the current element being
     // resolved) and the class of [type]. If the class of [type] requires RTI,
     // then the class of the type variable does too.
     ClassElement contextClass = Types.getClassContext(type);
     if (contextClass != null) {
       assert(contextClass == enclosingElement.enclosingClass.declaration);
       rti.registerRtiDependency(type.element, contextClass);
     }
   }
 
-  void registerClassUsingVariableExpression(ClassElement cls) {
-    rti.classesUsingTypeVariableExpression.add(cls);
-  }
-
   bool classNeedsRti(ClassElement cls) {
     return rti.classesNeedingRti.contains(cls.declaration) ||
         compiler.enabledRuntimeType;
   }
 
   bool isComplexNoSuchMethod(FunctionElement element) =>
     noSuchMethodRegistry.isComplex(element);
 
   bool isDefaultEqualityImplementation(Element element) {
     assert(element.name == '==');
@@ skipping 1593 matching lines @@
   }
 
   void onSyncForIn(Registry registry) {
     assert(registry.isForResolution);
     // The SSA builder recognizes certain for-in loops and can generate calls to
     // throwConcurrentModificationError.
     registerBackendStaticInvocation(
         backend.getCheckConcurrentModificationError(), registry);
   }
 
-  void onTypeVariableExpression(Registry registry) {
+  void onTypeVariableExpression(Registry registry,
+                                TypeVariableElement variable) {
     assert(registry.isForResolution);
     registerBackendStaticInvocation(backend.getSetRuntimeTypeInfo(), registry);
     registerBackendStaticInvocation(backend.getGetRuntimeTypeInfo(), registry);
     backend.registerGetRuntimeTypeArgument(registry);
     registerBackendInstantiation(backend.compiler.listClass, registry);
     registerBackendStaticInvocation(backend.getRuntimeTypeToString(), registry);
     registerBackendStaticInvocation(backend.getCreateRuntimeType(), registry);
     needsInt(registry, 'Needed for accessing a type variable literal on this.');
+    ClassElement cls = variable.enclosingClass;
+    backend.rti.classesUsingTypeVariableExpression.add(cls);
   }
 
   // TODO(johnniwinther): Maybe split this into [onAssertType] and [onTestType].
   void onIsCheck(DartType type, Registry registry) {
     assert(registry.isForResolution);
     type = type.unalias(backend.compiler);
     registerBackendInstantiation(backend.compiler.boolClass, registry);
     bool inCheckedMode = backend.compiler.enableTypeAssertions;
     if (inCheckedMode) {
       registerBackendStaticInvocation(backend.getThrowRuntimeError(), registry);
@@ skipping 152 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }