Handle local functions in kernel_impact.

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 f688ff7f0d66813c8d0b9edd9b6c0b5f5f7ebfb0..a2a2d5786d07bfba59291d814ffe18a457fcae76 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -2996,6 +2996,10 @@ class JavaScriptImpactTransformer extends ImpactTransformer {
           // TODO(johnniwinther): Store the correct use in impacts.
           new StaticUse.foreignUse(staticUse));
     }
+    for (Selector selector in backendImpact.dynamicUses) {
+      assert(selector != null);
+      worldImpact.registerDynamicUse(new DynamicUse(selector, null));
+    }
     for (InterfaceType instantiatedType in backendImpact.instantiatedTypes) {
       backend.registerBackendUse(instantiatedType.element);
       worldImpact.registerTypeUse(new TypeUse.instantiation(instantiatedType));