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

tests/language/arithmetic_smi_overflow_test.dart

 // 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.
 // Dart test program to test arithmetic operations.
 
-// VMOptions=--optimization_counter_threshold=5
+// VMOptions=--optimization_counter_threshold=5 --no-background_compilation
 
 import "package:expect/expect.dart";
 
 main() {
   for (var i = 0; i < 10; i++) {
     Expect.equals(0x40000000, (i - i) - -1073741824);
     Expect.equals(0x4000000000000000, (i - i) - -4611686018427387904);
   }
 }