VM: Restore a test with pointer verification

runtime/vm/custom_isolate_test.cc

Index: runtime/vm/custom_isolate_test.cc
diff --git a/runtime/vm/custom_isolate_test.cc b/runtime/vm/custom_isolate_test.cc
index 1f55a8ee022cfc1ec206bbc2482ae18446e6114c..1995ee651c4e50723d34aa9997487f4660c895e8 100644
--- a/runtime/vm/custom_isolate_test.cc
+++ b/runtime/vm/custom_isolate_test.cc
@@ -323,10 +323,6 @@ UNIT_TEST_CASE(CustomIsolates) {
   FLAG_verify_handles = true;
 #ifdef DEBUG
   FLAG_verify_on_transition = true;
-  // Cannot verify heap while running compilation in background. Issue #26149.
-  FLAG_background_compilation = false;
-  // Issue #26150.
-  FLAG_use_osr = false;
 #endif
   event_queue = new EventQueue();