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

tests/language/try_catch_optimized4_test.dart

Index: tests/language/try_catch_optimized4_test.dart
diff --git a/tests/language/try_catch_optimized4_test.dart b/tests/language/try_catch_optimized4_test.dart
index 7cad947e751226b8427282989c07476f69ad5b10..b3dd0dd7383fed5c40445df91ec8f8344138efd3 100644
--- a/tests/language/try_catch_optimized4_test.dart
+++ b/tests/language/try_catch_optimized4_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
 
 import "package:expect/expect.dart";