Swap cons cell order in run-time for Iniquity+.

Author: dvanhorn

iniquity-plus/values.h

@@ -27,8 +27,8 @@ typedef struct val_box_t {
   val_t val;
 } val_box_t;
 typedef struct val_cons_t {
-  val_t snd;
   val_t fst;
+  val_t snd;
 } val_cons_t;
 typedef struct val_vect_t {
   uint64_t len;