Handle metadata on nested function parameters.

sdk/lib/_internal/compiler/implementation/deferred_load.dart

Index: sdk/lib/_internal/compiler/implementation/deferred_load.dart
diff --git a/sdk/lib/_internal/compiler/implementation/deferred_load.dart b/sdk/lib/_internal/compiler/implementation/deferred_load.dart
index ba055a7c598652184bce7340fd536c10d11af778..1084061948d43bc1dbf7dfcffac815e60143945f 100644
--- a/sdk/lib/_internal/compiler/implementation/deferred_load.dart
+++ b/sdk/lib/_internal/compiler/implementation/deferred_load.dart
@@ -54,7 +54,7 @@ import 'tree/tree.dart' as ast;
 
 import 'resolution/resolution.dart' show
     TreeElements,
-    AnalyzableElement;
+    AnalyzableElementX;
 
 /// A "hunk" of the program that will be loaded whenever one of its [imports]
 /// are loaded.
@@ -452,7 +452,7 @@ class DeferredLoadTask extends CompilerTask {
       // TODO(sigurdm): Unresolved elements should just answer false when
       // asked isNeededForReflection. Instead an internal error is triggered.
       // So we have to filter them out here.
-      if (element is AnalyzableElement && !element.hasTreeElements) return;
+      if (element is AnalyzableElementX && !element.hasTreeElements) return;
       if (compiler.backend.isNeededForReflection(element)) {
         _mapDependencies(element, deferredImport);
       }