Workaround for miscompilation with optlevel `-Oz`.

--- a/psi/idict.c
+++ b/psi/idict.c
@@ -217,7 +217,8 @@
         make_tasv(&pdict->keys, t_shortarray,
                   r_space(&arr) | a_all | new_mask,
                   asize, packed, pkp);
-        for (pzp = pkp, i = 0; i < asize || i % packed_per_ref; pzp++, i++)
+        for (pzp = pkp, i = 0;                                ; pzp++, i++)
+            if (!(             i < asize || i % packed_per_ref)) break; else
             *pzp = packed_key_empty;
         *pkp = packed_key_deleted;	/* wraparound entry */
     } else {			/* not packed */