Support enclosingClass on deserialized local elements

pkg/compiler/lib/src/serialization/modelz.dart

Index: pkg/compiler/lib/src/serialization/modelz.dart
diff --git a/pkg/compiler/lib/src/serialization/modelz.dart b/pkg/compiler/lib/src/serialization/modelz.dart
index e0c60ba8b9a130cff42fcc1f4d91efb91440b61d..ea6752aad9bf045a3f46539153a0e65459164e74 100644
--- a/pkg/compiler/lib/src/serialization/modelz.dart
+++ b/pkg/compiler/lib/src/serialization/modelz.dart
@@ -1500,6 +1500,8 @@ class ForwardingConstructorElementZ extends ElementZ
 
 abstract class MemberElementMixin
     implements DeserializedElementZ, MemberElement {
+  final List<FunctionElement> nestedClosures = <FunctionElement>[];
+
   @override
   MemberElement get memberContext => this;
 
@@ -1507,10 +1509,12 @@ abstract class MemberElementMixin
   Name get memberName => new Name(name, library);
 
   @override
-  List<FunctionElement> get nestedClosures => <FunctionElement>[];
+  bool get isInjected => _decoder.getBool(Key.IS_INJECTED);
 
   @override
-  bool get isInjected => _decoder.getBool(Key.IS_INJECTED);
+  void forgetElement() {
+    nestedClosures.clear();
+  }
 }
 
 abstract class FieldElementZ extends DeserializedElementZ
@@ -1637,6 +1641,9 @@ abstract class LocalExecutableMixin
   Element get enclosingElement => executableContext;
 
   @override
+  Element get enclosingClass => memberContext.enclosingClass;
+
+  @override
   ExecutableElement get executableContext {
     if (_executableContext == null) {
       _executableContext = _decoder.getElement(Key.EXECUTABLE_CONTEXT);