Background compilation work:

tests/language/vm/load_elimination_any_use_creates_alias_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.
 // Test correctness of side effects tracking used by load to load forwarding.
 
-// VMOptions=--no-use-osr --optimization-counter-threshold=10 --enable-inlining-annotations
+// VMOptions=--no-use-osr --optimization-counter-threshold=10 --enable-inlining-annotations --no-background-compilation
 
 import "package:expect/expect.dart";
 
 const alwaysInline = "AlwaysInline";
 const noInline = "NeverInline";
 
 B G;
 
 @noInline
 modify() {
@@ skipping 26 matching lines @@
   foo(b);
   return b.bval;
 }
 
 main() {
   foo(new C());
   foo(new B());
   for (var i = 0; i < 100; i++) test();
   Expect.equals(123, test());
 }