With --noopt run unoptimized code through optimizer, more optimizations can be done later.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index aeb798833557a3b06b90ade0ce623bd83e8a7ac1..79af5f8f3c1247c176ce8bd3216779d1af2156b9 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -6710,7 +6710,7 @@ void Function::RestoreICDataMap(
     ZoneGrowableArray<const ICData*>* deopt_id_to_ic_data) const {
   Zone* zone = Thread::Current()->zone();
   const Array& saved_icd = Array::Handle(zone, ic_data_array());
-  if (saved_icd.Length() == 0) {
+  if (saved_icd.IsNull() || (saved_icd.Length() == 0)) {
     deopt_id_to_ic_data->Clear();
     return;
   }