Added a server.arch_bits field instead of computing it at runtime for INFO.

src/redis.h

@@ -527,6 +527,7 @@ struct redisServer {
     int activerehashing;        /* Incremental rehash in serverCron() */
     char *requirepass;          /* Pass for AUTH command, or NULL */
     char *pidfile;              /* PID file path */
+    int arch_bits;              /* 32 or 64 depending on sizeof(long) */
     /* Networking */
     int port;                   /* TCP listening port */
     char *bindaddr;             /* Bind address or NULL */