Add libgmp 6.2.0 to third_party

Don't build it yet.  That will come in the next review.

Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/tune/hppa.asm b/third_party/gmp/tune/hppa.asm
new file mode 100644
index 0000000..fc9d62e
--- /dev/null
+++ b/third_party/gmp/tune/hppa.asm
@@ -0,0 +1,42 @@
+dnl  HPPA 32-bit time stamp counter access routine.
+
+dnl  Copyright 2000, 2002, 2005 Free Software Foundation, Inc.
+
+dnl  This file is part of the GNU MP Library.
+dnl
+dnl  The GNU MP Library is free software; you can redistribute it and/or modify
+dnl  it under the terms of either:
+dnl
+dnl    * the GNU Lesser General Public License as published by the Free
+dnl      Software Foundation; either version 3 of the License, or (at your
+dnl      option) any later version.
+dnl
+dnl  or
+dnl
+dnl    * the GNU General Public License as published by the Free Software
+dnl      Foundation; either version 2 of the License, or (at your option) any
+dnl      later version.
+dnl
+dnl  or both in parallel, as here.
+dnl
+dnl  The GNU MP Library is distributed in the hope that it will be useful, but
+dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+dnl  for more details.
+dnl
+dnl  You should have received copies of the GNU General Public License and the
+dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
+dnl  see https://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+dnl void speed_cyclecounter (unsigned p[2]);
+dnl
+dnl Get the HPPA interval timer.
+
+PROLOGUE(speed_cyclecounter)
+	mfctl	%cr16,%r28
+	stw	%r28,0(0,%r26)
+	bv	0(%r2)
+	stw	%r0,4(0,%r26)
+EPILOGUE(speed_cyclecounter)