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

tests/language/vm/allocation_sinking_vm_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 allocation sinking optimization.
-// VMOptions=--optimization-counter-threshold=10 --no-use-osr
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr --no-background-compilation
 
 import 'dart:typed_data';
 import 'package:expect/expect.dart';
 
 class Point {
   var x, y;
 
   Point(this.x, this.y);
 
   operator * (other) {
@@ skipping 307 matching lines @@
   Expect.equals(z0, z1);
   Expect.equals(z0, z2);
 
   testFinalField();
   testVMField();
   testCompound1();
   testCompound2();
   testCompound3();
   testCompound4();
 }