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

tests/language/vm/store_elimination_vm_test.dart

Index: tests/language/vm/store_elimination_vm_test.dart
diff --git a/tests/language/vm/store_elimination_vm_test.dart b/tests/language/vm/store_elimination_vm_test.dart
index 8a3dcd7f6fa977c564832e25cf2cad740c304307..21e2102ed1594ee900a5b28296372ae85522a745 100644
--- a/tests/language/vm/store_elimination_vm_test.dart
+++ b/tests/language/vm/store_elimination_vm_test.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 // Test correctness of side effects tracking used by load to load forwarding.
 
-// VMOptions=--optimization-counter-threshold=10
+// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
 
 import "package:expect/expect.dart";