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

tests/language/deferred_load_inval_code_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.
 //
-// VMOptions=--optimization-counter-threshold=100
+// VMOptions=--optimization-counter-threshold=100 --no-background-compilation
 
 import "deferred_load_inval_code_lib.dart" deferred as d;
 
 bool loaded = false;
 
 var x = 0;
 
 bla() {
   if (loaded) {
     // Loading the library should have invalidated the optimized
@@ skipping 13 matching lines @@
   }
 }
 
 main() {
   warmup();
   d.loadLibrary().then((_) {
     loaded = true;
     bla();
   });
 }