Basic constant folding implementation

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+Copyright 2011-2013, 2018 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/.
+
+
+This is "mini-gmp", a small implementation of a subset of GMP's mpn,
+mpz and mpq interfaces.
+
+It is intended for applications which need arithmetic on numbers
+larger than a machine word, but which don't need to handle very large
+numbers very efficiently. Those applications can include a copy of
+mini-gmp to get a GMP-compatible interface with small footprint. One
+can also arrange for optional linking with the real GMP library, using
+mini-gmp as a fallback when for some reason GMP is not available, or
+not desired as a dependency.
+
+The supported GMP subset of the mpn and mpz interfaces is declared in
+mini-gmp.h, and implemented in mini-gmp.c. The implemented
+functions are fully compatible with the corresponding GMP functions,
+as specified in the GMP manual, with a few exceptions:
+
+  mpz_export and mpz_import support only NAILS = 0.
+
+The performance target for mini-gmp is to be at most 10 times slower
+than the real GMP library, for numbers of size up to a few hundred
+bits. No asymptotically fast algorithms are included in mini-gmp, so
+it will be many orders of magnitude slower than GMP for very large
+numbers.
+
+The supported GMP subset of the mpq layer is declared in mini-mpq.h,
+and implemented in mini-mpq.c.
+
+You should never "install" mini-gmp. Applications can either just
+#include mini-gmp.c (but then, beware that it defines several macros
+and functions outside of the advertised interface), and if needed
+#include mini-mpq.c in a later line (order is important). Or compile
+mini-gmp.c and mini-mpq.c as separate compilation units, and use the
+declarations in mini-gmp.h and mini-mpq.h.
+
+The tests subdirectory contains a testsuite. To use it, you need GMP
+and GNU make. Just run make check in the tests directory. If the
+hard-coded compiler settings are not right, you have to either edit the
+Makefile or pass overriding values on the make command line (e.g.,
+make CC=cc check).
+
+The initial version of mini-gmp was put together by Niels Möller
+<nisse@lysator.liu.se>, with a fair amount of copy-and-paste from the
+GMP sources.