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

tests/language/vm/licm_constant_redefinition_vm_test.dart

 // Copyright (c) 2015, 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=100 --no-use-osr
+// VMOptions=--optimization_counter_threshold=100 --no-use-osr --no-background_compilation
 
 import "package:expect/expect.dart";
 
 class X {
   final nested = [];
 
   get length => nested.length;
 }
 
 loop(val) {
@@ skipping 11 matching lines @@
 main() {
   // Provide polymorphic type feedback.
   loop("");
   loop(new X());
 
   // Optimize loop with a constant argument.
   for (var i = 0; i < 100; i++) {
     testRedef();
   }
 }