Reuse RuntimeTypesNeedBuilderImpl and _RuntimeTypesNeed for kernel based elements

pkg/compiler/lib/src/common_elements.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.
 
 // TODO(sigmund): rename and move to common/elements.dart
 library dart2js.type_system;
 
 import 'common/names.dart' show Identifiers, Uris;
 import 'js_backend/constant_system_javascript.dart';
 import 'elements/types.dart';
@@ skipping 1165 matching lines @@
       {bool required: false});
 
   /// Calls [f] for each class member declared or inherited in [cls] together
   /// with the class that declared the member.
   ///
   /// TODO(johnniwinther): This should not include static members of
   /// superclasses.
   void forEachClassMember(
       ClassEntity cls, void f(ClassEntity declarer, MemberEntity member));
 
-  /// Returns the declared superclass of [cls].
+  /// Returns the superclass of [cls].
   ///
   /// Unnamed mixin applications are included, for instance for these classes
   ///
   ///     class S {}
   ///     class M {}
   ///     class C extends S with M {}
   ///
   /// the result of `getSuperClass(C)` is the unnamed mixin application
   /// typically named `S+M` and `getSuperClass(S+M)` is `S`.
   ClassEntity getSuperClass(ClassEntity cls);
@@ skipping 14 matching lines @@
   DartType get dynamicType;
 
   /// Returns the 'raw type' of [cls]. That is, the instantiation of [cls]
   /// where all types arguments are `dynamic`.
   InterfaceType getRawType(ClassEntity cls);
 
   /// Returns the 'this type' of [cls]. That is, the instantiation of [cls]
   /// where the type arguments are the type variables of [cls].
   InterfaceType getThisType(ClassEntity cls);
 
+  /// Returns `true` if [cls] is generic.
+  bool isGenericClass(ClassEntity cls);
+
   /// The upper bound on the [typeVariable]. If not explicitly declared, this is
   /// `Object`.
   DartType getTypeVariableBound(TypeVariableEntity typeVariable);
 
   /// Returns `true` if [a] is a subtype of [b].
   bool isSubtype(DartType a, DartType b);
 
   /// Returns the type if [function].
   FunctionType getFunctionType(FunctionEntity function);
 
   /// Returns the type of the [local] function.
   FunctionType getLocalFunctionType(Local local);
 
   /// Returns the unaliased type of [type].
   ///
   /// Use this during resolution to ensure that the alias has been computed.
   // TODO(johnniwinther): Remove this when the resolver is removed.
   DartType getUnaliasedType(DartType type);
 
   /// Returns the [CallStructure] corresponding to calling [entity] with all
   /// arguments, both required and optional.
   CallStructure getCallStructure(FunctionEntity entity);
 
   /// Returns `true` if [member] a the synthetic getter `loadLibrary` injected
   /// on deferred libraries.
   bool isDeferredLoadLibraryGetter(MemberEntity member);
 }