Handle deserialized compilation of closures

pkg/compiler/lib/src/js_backend/backend.dart

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index 35f6cb8efe4a2525f5719af4baf444f76d30d8f0..1e964430fe44fdb66637c0fae98c43499826248f 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -2507,6 +2507,19 @@ class JSFrontendAccess implements Frontend {
   }
 
   @override
+  bool hasResolvedAst(Element element) {
+    if (element is SynthesizedCallMethodElementX) {
+      return true;
+    } else if (element is ConstructorBodyElementX) {
+      return true;
+    } else if (element is FieldElementX) {
+      return true;
+    } else {
+      return resolution.hasResolvedAst(element);
+    }
+  }
+
+  @override
   ResolvedAst getResolvedAst(Element element) {
     if (element is SynthesizedCallMethodElementX) {
       return element.resolvedAst;