Compute also constant dependencies reference in method bodies.

pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart

Index: pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart b/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
index 14151e2b77740c612e94c03cb30f17a6e1c27d5e..6c47c0c85de06c76c4cf449e55bcfbcc5443b49d 100644
--- a/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart
@@ -462,6 +462,15 @@ class AnalyzerImpl {
       unit.accept(constantFinder);
       _constants.addAll(constantFinder.constantsToCompute);
     }
+
+    //
+    // Find constant dependencies to compute.
+    //
+    {
+      var finder = new ConstantExpressionsDependenciesFinder();
+      unit.accept(finder);
+      _constants.addAll(finder.dependencies);
+    }
   }
 
   /**