Make ResolveVariableReferencesTask depend on RESOLVED_UNIT3.

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index eb2c9213fff8edd9a1a9530df1218f7f83a714ad..f95ca07aa27dd0ac779a4597fa1eecef6821750a 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -3754,7 +3754,7 @@ class ResolveVariableReferencesTask extends SourceBasedAnalysisTask {
     LibrarySpecificUnit unit = target;
     return <String, TaskInput>{
       LIBRARY_INPUT: LIBRARY_ELEMENT1.of(unit.library),
-      UNIT_INPUT: RESOLVED_UNIT1.of(unit),
+      UNIT_INPUT: RESOLVED_UNIT3.of(unit),
       TYPE_PROVIDER_INPUT: TYPE_PROVIDER.of(AnalysisContextTarget.request)
     };
   }