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

tests/language/try_catch_optimized1_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.
-// VMOptions=--optimization-counter-threshold=10
+// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
 
 import "package:expect/expect.dart";
 
 maythrow(x) {
   if (x == null) throw 42;
   return 99;
 }
 
 
 f1(x) {
@@ skipping 276 matching lines @@
   Expect.equals(0, f11(null));
 
   for (var i = 0; i < 20; i++) f12(null);
   f12(null);
 
   f13(null);
   for (var i = 0; i < 20; i++) f13("abc");
   Expect.equals(99, f13("abc"));
   Expect.equals(1, f13(null));
 }