isThreadlocal

                pub fn isThreadlocal(id: Id) bool {
                    return switch (id) {
                        .var_threadlocal,
                        .pub_var_threadlocal,
                        .extern_var_threadlocal,
                        .pub_extern_var_threadlocal,
                        .export_var_threadlocal,
                        .pub_export_var_threadlocal,
                        => true,
                        else => false,
                    };
                }