Add test to ensure unadjusted stays unstable

Author: est31

src/test/compile-fail/unadjusted-unstable.rs

@@ -0,0 +1,17 @@
+// Copyright 2016 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.
+
+extern "unadjusted" fn foo() {
+//~^ ERROR: unadjusted ABI is an implementation detail and perma-unstable
+}
+
+fn main() {
+    foo();
+}