Add --no-background-compilation to tests that expect to run code in optimized form

tests/language/deferred_inlined_test.dart

Index: tests/language/deferred_inlined_test.dart
diff --git a/tests/language/deferred_inlined_test.dart b/tests/language/deferred_inlined_test.dart
index 4808a3fa29e5a6be69e946c2f0e20eebdd24235d..bede59660a3779133d81c6e378707584a052593b 100644
--- a/tests/language/deferred_inlined_test.dart
+++ b/tests/language/deferred_inlined_test.dart
@@ -1,7 +1,7 @@
 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
-// VMOptions=--optimization-counter-threshold=10
+// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
 
 // Declares foo that returns 42.
 import "deferred_constraints_lib2.dart" deferred as lib;