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

tests/standalone/regress_25335_test.dart

 // Copyright (c) 2016, 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.
 //
 // Test that canonicalization inserts constants with correct representation.
-// VMOptions=--optimization-counter-threshold=10 --optimization-filter=bar
+// VMOptions=--optimization-counter-threshold=10 --optimization-filter=bar --no-background-compilation
 
 import 'dart:typed_data';
 
 toSigned(v, width) {
   var signMask = 1 << (width - 1);
   return (v & (signMask - 1)) - (v & signMask);
 }
 
 foo(value) {
   return value >> 32;
 }
 
 bar(td) {
   return toSigned(foo(td[0]), 64);
 }
 
 main() {
   toSigned(1 << 1, 32);
   toSigned(1 << 32, 32);
 
   var l = new Int64List(1);
   l[0] = 0xf8f7f6f5f4f3f2f1;
 
   for (var i = 0; i < 20; i++) {
     bar(l);
   }
 }