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

tests/language/osr_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.
-// VMOptions=--optimization-counter-threshold=5
+// VMOptions=--optimization-counter-threshold=5 --no-background-compilation
 // Test correct OSR (issue 16151).
 
 import "dart:collection";
 import "package:expect/expect.dart";
 
 List create([int length]) {
   return new MyList(length);
-}  
+}
 
 main() {
-  test(create);  
+  test(create);
 }
 
 
 class MyList<E> extends ListBase<E> {
   List<E> _list;
-  
+
   MyList([int length]): _list = (length==null ? new List() : new List(length));
-  
+
   E operator [](int index) => _list[index];
 
   void operator []=(int index, E value) {
     _list[index]=value;
   }
 
   int get length => _list.length;
 
   void set length(int newLength) {
     _list.length=newLength;
   }
 }
 
 
 test(List create([int length])) {
-  sort_A01_t02_test(create);  
+  sort_A01_t02_test(create);
 }
 
 //  From library co19 sort_A01_t02.
 
 sort_A01_t02_test(List create([int length])) {
   int c(var a, var b) {
     return a < b ? -1 : (a == b ? 0 : 1);
   }
 
   int maxlen = 7;
@@ skipping 37 matching lines @@
             swap(0, n-1);
           } else {
             swap(i, n-1);
           }
         }
       }
     } //void permute
     permute(length);
   } //for i in 0..length
 } // test