Cleanups and preemptively pass Heap::kOld whenever subtype testing in compiler

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 d1ea43e54f8fdb4e61d29e08aaf3f64cfa6f7363..888017e80581f9685a948aedb6f75092c17cfcf7 100644
--- a/runtime/vm/flow_graph_optimizer.cc
+++ b/runtime/vm/flow_graph_optimizer.cc
@@ -4008,7 +4008,8 @@ RawBool* FlowGraphOptimizer::InstanceOfAsBool(
         TypeArguments::Handle(Z),
         type_class,
         TypeArguments::Handle(Z),
-        NULL);
+        NULL,
+        Heap::kOld);
     results->Add(cls.id());
     results->Add(is_subtype);
     if (prev.IsNull()) {
@@ -4099,7 +4100,8 @@ static bool TryExpandTestCidsResult(ZoneGrowableArray<intptr_t>* results,
     const bool smi_is_subtype = cls.IsSubtypeOf(TypeArguments::Handle(),
                                                 type_class,
                                                 TypeArguments::Handle(),
-                                                NULL);
+                                                NULL,
+                                                Heap::kOld);
     results->Add((*results)[results->length() - 2]);
     results->Add((*results)[results->length() - 2]);
     for (intptr_t i = results->length() - 3; i > 1; --i) {