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/mpn/sparc64/gmp-mparam.h b/third_party/gmp/mpn/sparc64/gmp-mparam.h
new file mode 100644
index 0000000..5ac2c46
--- /dev/null
+++ b/third_party/gmp/mpn/sparc64/gmp-mparam.h
@@ -0,0 +1,139 @@
+/* Sparc64 gmp-mparam.h -- Compiler/machine parameter header file.
+
+Copyright 1991, 1993, 1994, 1999-2002, 2004, 2006, 2008-2010 Free Software
+Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+  * the GNU Lesser General Public License as published by the Free
+    Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+The GNU MP Library 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 copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.  */
+
+#define GMP_LIMB_BITS 64
+#define GMP_LIMB_BYTES 8
+
+/* 500 MHz ultrasparc2 running GNU/Linux */
+
+#define DIVREM_1_NORM_THRESHOLD              3
+#define DIVREM_1_UNNORM_THRESHOLD            4
+#define MOD_1_NORM_THRESHOLD                 3
+#define MOD_1_UNNORM_THRESHOLD               3
+#define MOD_1N_TO_MOD_1_1_THRESHOLD      MP_SIZE_T_MAX  /* never */
+#define MOD_1U_TO_MOD_1_1_THRESHOLD         22
+#define MOD_1_1_TO_MOD_1_2_THRESHOLD         0  /* never mpn_mod_1_1p */
+#define MOD_1_2_TO_MOD_1_4_THRESHOLD        27
+#define PREINV_MOD_1_TO_MOD_1_THRESHOLD  MP_SIZE_T_MAX  /* never */
+#define USE_PREINV_DIVREM_1                  1
+#define DIVEXACT_1_THRESHOLD                 0  /* always */
+#define BMOD_1_TO_MOD_1_THRESHOLD        MP_SIZE_T_MAX  /* never */
+
+#define MUL_TOOM22_THRESHOLD                30
+#define MUL_TOOM33_THRESHOLD               187
+#define MUL_TOOM44_THRESHOLD               278
+#define MUL_TOOM6H_THRESHOLD               278
+#define MUL_TOOM8H_THRESHOLD               357
+
+#define MUL_TOOM32_TO_TOOM43_THRESHOLD     201
+#define MUL_TOOM32_TO_TOOM53_THRESHOLD     199
+#define MUL_TOOM42_TO_TOOM53_THRESHOLD     154
+#define MUL_TOOM42_TO_TOOM63_THRESHOLD     107
+
+#define SQR_BASECASE_THRESHOLD              13
+#define SQR_TOOM2_THRESHOLD                 69
+#define SQR_TOOM3_THRESHOLD                116
+#define SQR_TOOM4_THRESHOLD                336
+#define SQR_TOOM6_THRESHOLD                336
+#define SQR_TOOM8_THRESHOLD                454
+
+#define MULMOD_BNM1_THRESHOLD               17
+#define SQRMOD_BNM1_THRESHOLD               23
+
+#define MUL_FFT_MODF_THRESHOLD             248  /* k = 5 */
+#define MUL_FFT_TABLE3                                      \
+  { {    248, 5}, {      9, 4}, {     19, 6}, {      5, 5}, \
+    {     15, 6}, {      8, 5}, {     17, 6}, {     21, 7}, \
+    {     19, 8}, {     11, 7}, {     25, 8}, {     15, 7}, \
+    {     31, 8}, {     27, 9}, {     15, 8}, {     33, 9}, \
+    {     19, 8}, {     39, 9}, {     27,10}, {     15, 9}, \
+    {     39,10}, {     23, 9}, {     47,11}, {     15,10}, \
+    {     31, 9}, {     67,10}, {     39, 9}, {     79,10}, \
+    {     47,11}, {     31,10}, {     63, 9}, {    127, 8}, \
+    {    255,10}, {     71, 9}, {    143, 8}, {    287,10}, \
+    {     79,11}, {     47,12}, {   4096,13}, {   8192,14}, \
+    {  16384,15}, {  32768,16}, {  65536,17}, { 131072,18}, \
+    { 262144,19}, { 524288,20}, {1048576,21}, {2097152,22}, \
+    {4194304,23}, {8388608,24} }
+#define MUL_FFT_TABLE3_SIZE 50
+#define MUL_FFT_THRESHOLD                 1984
+
+#define SQR_FFT_MODF_THRESHOLD             236  /* k = 5 */
+#define SQR_FFT_TABLE3                                      \
+  { {    236, 5}, {      8, 4}, {     17, 5}, {     19, 6}, \
+    {     10, 5}, {     21, 6}, {     19, 7}, {     10, 6}, \
+    {     21, 7}, {     21, 8}, {     21, 9}, {     11, 8}, \
+    {     23, 9}, {     19, 8}, {     43, 9}, {     23,10}, \
+    {     15, 9}, {     43,10}, {     23,11}, {     15,10}, \
+    {     31, 9}, {     63,10}, {     47, 8}, {    191,11}, \
+    {     31,10}, {     63, 8}, {    255, 7}, {    511, 9}, \
+    {    135, 8}, {    271,10}, {     71, 9}, {    143, 8}, \
+    {    287, 7}, {    575,11}, {     47, 9}, {    191, 8}, \
+    {    383,12}, {   4096,13}, {   8192,14}, {  16384,15}, \
+    {  32768,16}, {  65536,17}, { 131072,18}, { 262144,19}, \
+    { 524288,20}, {1048576,21}, {2097152,22}, {4194304,23}, \
+    {8388608,24} }
+#define SQR_FFT_TABLE3_SIZE 49
+#define SQR_FFT_THRESHOLD                 1120
+
+#define MULLO_BASECASE_THRESHOLD            16
+#define MULLO_DC_THRESHOLD                  41
+#define MULLO_MUL_N_THRESHOLD             3791
+
+#define DC_DIV_QR_THRESHOLD                 27
+#define DC_DIVAPPR_Q_THRESHOLD             100
+#define DC_BDIV_QR_THRESHOLD                47
+#define DC_BDIV_Q_THRESHOLD                174
+
+#define INV_MULMOD_BNM1_THRESHOLD           58
+#define INV_NEWTON_THRESHOLD                13
+#define INV_APPR_THRESHOLD                   9
+
+#define BINV_NEWTON_THRESHOLD              187
+#define REDC_1_TO_REDC_2_THRESHOLD          10
+#define REDC_2_TO_REDC_N_THRESHOLD         115
+
+#define MU_DIV_QR_THRESHOLD                680
+#define MU_DIVAPPR_Q_THRESHOLD             618
+#define MUPI_DIV_QR_THRESHOLD                0  /* always */
+#define MU_BDIV_QR_THRESHOLD               748
+#define MU_BDIV_Q_THRESHOLD                889
+
+#define MATRIX22_STRASSEN_THRESHOLD         13
+#define HGCD_THRESHOLD                      53
+#define GCD_DC_THRESHOLD                   283
+#define GCDEXT_DC_THRESHOLD                186
+#define JACOBI_BASE_METHOD                   2
+
+#define GET_STR_DC_THRESHOLD                13
+#define GET_STR_PRECOMPUTE_THRESHOLD        16
+#define SET_STR_DC_THRESHOLD               390
+#define SET_STR_PRECOMPUTE_THRESHOLD      1665