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

tests/language/vm/regress_22693_vm_test.dart

 // Copyright (c) 2015, 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 location summary for Uint32 multiplication.
-// VMOptions=--optimization-counter-threshold=10 --no-use-osr
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr --no-background-compilation
 
 const MASK = 0xFFFFFFFF;
 
 uint32Mul(x, y) => (x * y) & MASK;
 
 main() {
   for (var i = 0; i < 20; i++) uint32Mul((1 << 63) - 1, 1);
 }