numbers: Define 128-bit integers if compiler supports

Signed-off-by: NAmitay Isaacs <amitay@ozlabs.org>
Reviewed-by: NTomas Mraz <tomas@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14784)

include/internal/numbers.h

@@ -61,6 +61,16 @@
 #  define UINT64_MAX __MAXUINT__(uint64_t)
 # endif
 
+# ifndef INT128_MAX
+#  if defined(__SIZEOF_INT128__) && __SIZEOF_INT128__ == 16
+typedef __int128_t int128_t;
+typedef __uint128_t uint128_t;
+#   define INT128_MIN __MININT__(int128_t)
+#   define INT128_MAX __MAXINT__(int128_t)
+#   define UINT128_MAX __MAXUINT__(uint128_t)
+#  endif
+# endif
+
 # ifndef SIZE_MAX
 #  define SIZE_MAX __MAXUINT__(size_t)
 # endif