{"ast_node_type":"function","tokens":[{"end":86,"kind":"keyword","start":0,"text":"fn"}]}
    fn ensure_pgo_func_name_var(&self, instance: Instance<'tcx>) -> &'ll llvm::Value {
    /// function "used", making it eligible to emit an associated covfun record.
        debug!("getting pgo_func_name_var for instance={:?}", instance);