Add missing intrinsic file.

From-SVN: r231945

gcc/config/i386/pkuintrin.h

+/* Copyright (C) 2015 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _X86INTRIN_H_INCLUDED
+# error "Never use <pkuintrin.h> directly; include <x86intrin.h> instead."
+#endif
+
+#ifndef _PKUINTRIN_H_INCLUDED
+#define _PKUINTRIN_H_INCLUDED
+
+#ifndef __PKU__
+#pragma GCC push_options
+#pragma GCC target("pku")
+#define __DISABLE_PKU__
+#endif /* __PKU__ */
+
+extern __inline unsigned int
+__attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_rdpkru_u32(void)
+{
+  return __builtin_ia32_rdpkru ();
+}
+
+extern __inline void
+__attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_wrpkru(unsigned int key)
+{
+  return __builtin_ia32_wrpkru (key);
+}
+
+#ifdef __DISABLE_PKU__
+#undef __DISABLE_PKU__
+#pragma GCC pop_options
+#endif /* __DISABLE_PKU__ */
+
+#endif /* _PKUINTRIN_H_INCLUDED */