fix license

src/librustc_incremental/persist/preds.rs

@@ -1,3 +1,13 @@
+// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 use rustc::dep_graph::{DepGraphQuery, DepNode};
 use rustc::hir::def_id::DefId;
 use rustc_data_structures::fnv::FnvHashMap;