Revert "dart2js: Destroy some type inference graph edges after type inference."

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

Index: pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
diff --git a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
index 418bd2d23728c6eecf5e6c962f299c5350a4f014..68cf701ff1467f387c9d2e877a8f1272abe7026a 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
@@ -1287,28 +1287,14 @@ class TypeGraphInferrerEngine
   }
 
   void clear() {
-    void cleanup(TypeInformation info) => info.cleanup();
-
-    allocatedCalls.forEach(cleanup);
     allocatedCalls.clear();
-
     defaultTypeOfParameter.clear();
-
-    types.typeInformations.values.forEach(cleanup);
-
-    types.allocatedTypes.forEach(cleanup);
+    types.typeInformations.values.forEach((info) => info.clear());
     types.allocatedTypes.clear();
-
     types.concreteTypes.clear();
-
-    types.allocatedClosures.forEach(cleanup);
     types.allocatedClosures.clear();
-
     analyzedElements.clear();
     generativeConstructorsExposingThis.clear();
-   
-    types.allocatedMaps.values.forEach(cleanup);
-    types.allocatedLists.values.forEach(cleanup);
   }
 
   Iterable<Element> getCallersOf(Element element) {