btf__add_func_param
err = btf__add_func_param(btf, param_name, params[i].type);
LIBBPF_API int btf__add_func_param(struct btf *btf, const char *name, int type_id);
err = btf__add_func_param(btf, "", p->type);
btf__add_func_param(btf2, "p1", 16);
btf__add_func_param(btf1, "p1", 1);
btf__add_func_param(btf, "p1", 1);
btf__add_func_param(btf, "p2", 3);
btf__add_func_param(split_btf, "p", 2);
btf__add_func_param(btf, "p", 2);
err = btf__add_func_param(btf, "p1", 1);
err = btf__add_func_param(btf, "p2", 2);