Move LocalDeclarationVisitor for use by contributors that will be moved to analyzer_plugin

pkg/analyzer_plugin/test/src/utilities/test_all.dart

Index: pkg/analyzer_plugin/test/src/utilities/test_all.dart
diff --git a/pkg/analyzer_plugin/test/src/utilities/test_all.dart b/pkg/analyzer_plugin/test/src/utilities/test_all.dart
index 70f35ca6bf536aa96bbccd1443a43c90f54d630b..e17066064c4810204bdf3a6a8fe0b94199f810e2 100644
--- a/pkg/analyzer_plugin/test/src/utilities/test_all.dart
+++ b/pkg/analyzer_plugin/test/src/utilities/test_all.dart
@@ -7,11 +7,13 @@ import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'change_builder/test_all.dart' as change_builder;
 import 'navigation_test.dart' as navigation_test;
 import 'string_utilities_test.dart' as string_utilities;
+import 'visitors/test_all.dart' as visitors;
 
 main() {
   defineReflectiveSuite(() {
     change_builder.main();
     navigation_test.main();
     string_utilities.main();
+    visitors.main();
   }, name: 'utilities');
 }