use UFCS in #[deriving(Hash)]

expansion now uses `::std:#️⃣:Hash::hash(&*__self_0_0, __arg_0)` instead of
`(*__self_0_0).hash(__arg_0)`

closes #21160

src/test/compile-fail/issue-21160.rs

@@ -0,0 +1,21 @@
+// Copyright 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.
+
+struct Bar;
+
+impl Bar {
+    fn hash<T>(&self, _: T) {}
+}
+
+#[derive(Hash)]
+//~^ error: the trait `core::hash::Hash<__S>` is not implemented for the type `Bar`
+struct Foo(Bar);
+
+fn main() {}