Implement stable resolution of generic types without type arguments to their bounds.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 3950dee808f53b96165cc85be76ea1e2e1795801..a00ab31e97f8abab14b052a419e2e1347109f926 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -1420,7 +1420,7 @@ class AnalysisServer {
     }
     // if library has not been resolved yet, the unit will be resolved later
     Source librarySource = librarySources[0];
-    if (context.getResult(librarySource, LIBRARY_ELEMENT5) == null) {
+    if (context.getResult(librarySource, LIBRARY_ELEMENT6) == null) {
       return null;
     }
     // if library has been already resolved, resolve unit