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

tests/language/no_such_method3_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.
 
 // Test that a static type inferrer takes [noSuchMethod] into account.
 
-// VMOptions=--optimization-counter-threshold=10
+// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
 
 import "package:expect/expect.dart";
 
 class A {
   B foobarbaz() {
     return new B();
   }
 }
 
 class B {
@@ skipping 11 matching lines @@
       b = new B();
   return b;
 }
 
 void main() {
   var x = bar();
   var y = x.foobarbaz();
   Expect.equals(42, y);
   Expect.isFalse(y is B);
 }