Use MemberEntity more in type_graph_nodes

pkg/compiler/lib/src/inferrer/node_tracer.dart

Index: pkg/compiler/lib/src/inferrer/node_tracer.dart
diff --git a/pkg/compiler/lib/src/inferrer/node_tracer.dart b/pkg/compiler/lib/src/inferrer/node_tracer.dart
index b639879df586e7364a9b1793786d84d28fd8fffb..ed1a0073c1c5317bc3aa21ca678dc2d17a66068b 100644
--- a/pkg/compiler/lib/src/inferrer/node_tracer.dart
+++ b/pkg/compiler/lib/src/inferrer/node_tracer.dart
@@ -80,7 +80,7 @@ abstract class TracerVisitor implements TypeInformationVisitor {
 
   static const int MAX_ANALYSIS_COUNT =
       const int.fromEnvironment('dart2js.tracing.limit', defaultValue: 32);
-  final Setlet<Element> analyzedElements = new Setlet<Element>();
+  final Setlet<MemberEntity> analyzedElements = new Setlet<MemberEntity>();
 
   TracerVisitor(this.tracedType, InferrerEngine inferrer)
       : this.inferrer = inferrer,