Fix crash looking at a Code object in an AOT program with the service protocol.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 7bf95a0dbd29193a2ecf3dd639ef4eb369029d49..b19ba7d9b205307402f94f3accd1ff6a35f58d76 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -12488,7 +12488,10 @@ const char* ICData::ToCString() const {
 
 RawFunction* ICData::Owner() const {
   Object& obj = Object::Handle(raw_ptr()->owner_);
-  if (obj.IsFunction()) {
+  if (obj.IsNull()) {
+    ASSERT(Dart::snapshot_kind() == Snapshot::kAppNoJIT);
+    return Function::null();
+  } else if (obj.IsFunction()) {
     return Function::Cast(obj).raw();
   } else {
     ICData& original = ICData::Handle();