Revert "Enable deferred deoptimization always."

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
diff --git a/runtime/vm/flow_graph_optimizer.cc b/runtime/vm/flow_graph_optimizer.cc
index 421ff45e2782d026f022a4749d8174503c4b4111..feb72c182727dddb0a72b8a412e2644f09e3e015 100644
--- a/runtime/vm/flow_graph_optimizer.cc
+++ b/runtime/vm/flow_graph_optimizer.cc
@@ -4654,10 +4654,14 @@ void FlowGraphOptimizer::VisitStoreInstanceField(
         }
       }
       field.set_is_unboxing_candidate(false);
-      // Delay deoptimization of dependent code to the code installation time.
-      // The invalidation of the background compilation result occurs only
-      // when the deoptimization is triggered at code installation.
-      flow_graph()->deoptimize_dependent_code().Add(&field);
+      if (Compiler::IsBackgroundCompilation()) {
+        // Delay deoptimization of dependent code to the code installation time.
+        // The invalidation of the background compilation result occurs only
+        // when the deoptimization is triggered at code installation.
+        flow_graph()->deoptimize_dependent_code().Add(&field);
+      } else {
+        field.DeoptimizeDependentCode();
+      }
     } else {
       FlowGraph::AddToGuardedFields(flow_graph_->guarded_fields(), &field);
     }