Fix for renaming (an invalid) ClassElement invocation.

pkg/analysis_server/lib/src/services/index/index_contributor.dart

Index: pkg/analysis_server/lib/src/services/index/index_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/index/index_contributor.dart b/pkg/analysis_server/lib/src/services/index/index_contributor.dart
index 18e5b1502487d591c3647b717360de223937eec9..34aec15cd47e211db0410d950296d5cafa84debe 100644
--- a/pkg/analysis_server/lib/src/services/index/index_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/index/index_contributor.dart
@@ -361,6 +361,9 @@ class _IndexContributor extends GeneralizingAstVisitor {
         element is VariableElement) {
       recordRelationshipElement(
           element, IndexConstants.IS_INVOKED_BY, location);
+    } else if (element is ClassElement) {
+      recordRelationshipElement(
+          element, IndexConstants.IS_REFERENCED_BY, location);
     }
     _recordImportElementReferenceWithoutPrefix(name);
     super.visitMethodInvocation(node);