VM: Fix lazy_deopt_vm_test timeouts by limiting (re)optimizations to a single function.

tests/language/vm/lazy_deopt_vm_test.dart

 // Copyright (c) 2016, 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=--deoptimize_every=10 --optimization-counter-threshold=10  --no-background-compilation
+// VMOptions=--optimization-filter=foo --deoptimize_every=10 --optimization-counter-threshold=10  --no-background-compilation
 
 // Test that lazy deoptimization on stack checks does not damage unoptimized
 // frame.
 
 import 'package:expect/expect.dart';
 
 
 foo() {
   var a = 0;
   var b = 1;
@@ skipping 14 matching lines @@
   Expect.equals(14, e);
 }
 
 main() {
   for (var i = 0; i < 10; ++i) {
     foo();
   }
 }