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/mini-gmp/tests/t-lcm.c b/third_party/gmp/mini-gmp/tests/t-lcm.c
new file mode 100644
index 0000000..f21a39a
--- /dev/null
+++ b/third_party/gmp/mini-gmp/tests/t-lcm.c
@@ -0,0 +1,73 @@
+/*
+
+Copyright 2012, Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library test suite.
+
+The GNU MP Library test suite 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 of the License,
+or (at your option) any later version.
+
+The GNU MP Library test suite 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.
+
+You should have received a copy of the GNU General Public License along with
+the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
+
+#include <limits.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "testutils.h"
+
+#define MAXBITS 400
+#define COUNT 10000
+
+void
+testmain (int argc, char **argv)
+{
+  unsigned i;
+  mpz_t a, b, g, s;
+
+  mpz_init (a);
+  mpz_init (b);
+  mpz_init (g);
+  mpz_init (s);
+
+  for (i = 0; i < COUNT; i++)
+    {
+      mini_random_op3 (OP_LCM, MAXBITS, a, b, s);
+      mpz_lcm (g, a, b);
+      if (mpz_cmp (g, s))
+	{
+	  fprintf (stderr, "mpz_lcm failed:\n");
+	  dump ("a", a);
+	  dump ("b", b);
+	  dump ("r", g);
+	  dump ("ref", s);
+	  abort ();
+	}
+      if (mpz_fits_ulong_p (b))
+	{
+	  mpz_set_si (g, 0);
+	  mpz_lcm_ui (g, a, mpz_get_ui (b));
+	  if (mpz_cmp (g, s))
+	    {
+	      fprintf (stderr, "mpz_lcm_ui failed:\n");
+	      dump ("a", a);
+	      dump ("b", b);
+	      dump ("r", g);
+	      dump ("ref", s);
+	      abort ();
+	    }
+	}
+    }
+
+  mpz_clear (a);
+  mpz_clear (b);
+  mpz_clear (g);
+  mpz_clear (s);
+}