Avoid emitting addStubs and tearOffCode when not needed.

pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
index 981ed489d31d8285a91eb1fc3f0aca80020f45d2..62ec2e3f4913706c7a7589334c2947473f8ce194 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart
@@ -452,7 +452,7 @@ class ContainerBuilder extends CodeEmitterHelper {
       }
       return;
     }
-
+    emitter.needsArrayInitializerSupport = true;
 
     // This element is needed for reflection or needs additional stubs or has a
     // super alias. So we need to retain additional information.