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

tests/language/optimize_redundant_array_load_test.dart

Index: tests/language/optimize_redundant_array_load_test.dart
diff --git a/tests/language/optimize_redundant_array_load_test.dart b/tests/language/optimize_redundant_array_load_test.dart
index 14549d22e86279a131ffc9b3ea4bb163ec8360b7..856b22520b3c95746b8fb1025ef02d47cba46714 100644
--- a/tests/language/optimize_redundant_array_load_test.dart
+++ b/tests/language/optimize_redundant_array_load_test.dart
@@ -1,7 +1,7 @@
 // Copyright (c) 2012, 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 --no-use-osr
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr --no-background-compilation
 
 import "package:expect/expect.dart";