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/usr/share/gocode/src/golang.org/x/crypto/curve25519/const_amd64.h is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.

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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This code was translated into a form compatible with 6a from the public
// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html

#define REDMASK51     0x0007FFFFFFFFFFFF