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

tests/lib/typed_data/float32x4_list_test.dart

 // Copyright (c) 2013, 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=--deoptimization_counter_threshold=1000 --optimization-counter-threshold=10
+// VMOptions=--deoptimization_counter_threshold=1000 --optimization-counter-threshold=10 --no-background_compilation
 
 // Library tag to be able to run in html test framework.
 library float32x4_list_test;
 
 import 'dart:typed_data';
 import 'package:expect/expect.dart';
 
 testLoadStore(array) {
   Expect.equals(8, array.length);
   Expect.isTrue(array is List<Float32x4>);
@@ skipping 232 matching lines @@
     testLoadStore(list);
   }
   for (int i = 0; i < 20; i++) {
     testListZero();
   }
   for (int i = 0; i < 20; i++) {
     testSpecialValues(list);
   }
   testLoadStoreDeoptDriver();
 }