message: type-erasure] Bump tracing level for mergeables missing ctor
  Summary: That's it.
diff: @@ -1089,7 +1089,7 @@ void Model::collect_methods() {
  merger.dmethods.emplace_back(method);
  }
  if (!has_ctor) {
  - TRACE(TERA, 1, "[TERA] No ctor found for mergeable %s", SHOW(type));
  + TRACE(TERA, 2, "[TERA] No ctor found for mergeable %s", SHOW(type));
  }
  const auto& virt_scopes = m_type_system.get_class_scopes().get(type);
  