More kernel_impact.

pkg/compiler/lib/src/js_backend/backend.dart

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index fd9efa19d9adfc5a6212a839148c1834d63927c5..f437157f94e56904c127bb516d8e747b72d685c7 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -2823,6 +2823,7 @@ class JavaScriptImpactTransformer extends ImpactTransformer {
           registerBackendImpact(transformed, impacts.fallThroughError);
           break;
         case Feature.FIELD_WITHOUT_INITIALIZER:
+        case Feature.LOCAL_WITHOUT_INITIALIZER:
           transformed.registerTypeUse(
               new TypeUse.instantiation(backend.coreTypes.nullType));
           registerBackendImpact(transformed, impacts.nullLiteral);