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

tests/language/vm/issue11087_vm_test.dart

Index: tests/language/vm/issue11087_vm_test.dart
diff --git a/tests/language/vm/issue11087_vm_test.dart b/tests/language/vm/issue11087_vm_test.dart
index f2a8fba1382d3a4b697107ca12fab299784a490d..fbfab0e4e78bf7a3e646d7e57e7360220d3815c9 100644
--- a/tests/language/vm/issue11087_vm_test.dart
+++ b/tests/language/vm/issue11087_vm_test.dart
@@ -5,7 +5,7 @@
 // Regression test for VM's IfConverted pass not keeping graph structure and
 // use lists in sync.
 
-// VMOptions=--optimization-counter-threshold=10
+// VMOptions=--optimization-counter-threshold=10 --no-background-compilation
 
 class A {
   int x;