Reuse RuntimeTypesNeedBuilderImpl and _RuntimeTypesNeed for kernel based elements

pkg/compiler/lib/src/resolution/resolution_strategy.dart

Index: pkg/compiler/lib/src/resolution/resolution_strategy.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_strategy.dart b/pkg/compiler/lib/src/resolution/resolution_strategy.dart
index c173ca30b861911e49c20b03dafa76fd15c92b39..2400bd99d121d7c45ce668f35138d7fce8d33433 100644
--- a/pkg/compiler/lib/src/resolution/resolution_strategy.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_strategy.dart
@@ -105,7 +105,8 @@ class ResolutionFrontEndStrategy implements FrontEndStrategy {
       new MirrorsResolutionAnalysisImpl(backend, _compiler.resolution);
 
   RuntimeTypesNeedBuilder createRuntimeTypesNeedBuilder() {
-    return new RuntimeTypesNeedBuilderImpl();
+    return new ResolutionRuntimeTypesNeedBuilderImpl(
+        elementEnvironment, _compiler.types);
   }
 
   ResolutionWorldBuilder createResolutionWorldBuilder(
@@ -229,6 +230,11 @@ class _CompilerElementEnvironment implements ElementEnvironment {
   }
 
   @override
+  bool isGenericClass(ClassEntity cls) {
+    return getThisType(cls).typeArguments.isNotEmpty;
+  }
+
+  @override
   ResolutionDartType getTypeVariableBound(TypeVariableElement typeVariable) {
     return typeVariable.bound;
   }