Make Death revive faster

Death will revive faster than the other riders.
Make all the riders revive after 67 turns, instead of 500.
There was practically a zero chance a rider would revive at 500,
so keep it somewhat sensible.

doc/fixes37.0

@@ -336,6 +336,7 @@ when fire damage dried a wet towel, it would never reduce the wetness to 0
 when water damage wet a towel, the new wetness might randomly become less
 when the wetness of a towel in inventory changed, persistent inventory wasn't
 	updated to show that
+make Death revive earlier, and all the Riders after 67 turns at latest
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

include/extern.h

@@ -1415,6 +1415,7 @@ E struct obj *FDECL(mk_named_object,
                     (int, struct permonst *, int, int, const char *));
 E struct obj *FDECL(rnd_treefruit_at, (int, int));
 E void FDECL(set_corpsenm, (struct obj *, int));
+E long FDECL(rider_revival_time, (struct obj *, BOOLEAN_P));
 E void FDECL(start_corpse_timeout, (struct obj *));
 E void FDECL(bless, (struct obj *));
 E void FDECL(unbless, (struct obj *));

src/do.c

@@ -1960,9 +1960,7 @@ long timeout UNUSED;
 
         if (is_rider(mptr) && rn2(99)) { /* Rider usually tries again */
             action = REVIVE_MON;
-            for (when = 3L; when < 67L; when++)
-                if (!rn2(3))
-                    break;
+            when = rider_revival_time(body, TRUE);
         } else { /* rot this corpse away */
             You_feel("%sless hassled.", is_rider(mptr) ? "much " : "");
             action = ROT_CORPSE;

src/mkobj.c

@@ -1146,6 +1146,23 @@ int id;
     }
 }
 
+/* Return the number of turns after which a Rider corpse revives */
+long
+rider_revival_time(body, retry)
+struct obj *body;
+boolean retry;
+{
+    long when;
+    long minturn = retry ? 3L : (body->corpsenm == PM_DEATH) ? 6L : 12L;
+
+    /* Riders have a 1/3 chance per turn of reviving after 12, 6, or 3 turns.
+       Always revive by 67. */
+    for (when = minturn; when < 67L; when++)
+        if (!rn2(3))
+            break;
+    return when;
+}
+
 /*
  * Start a corpse decay or revive timer.
  * This takes the age of the corpse into consideration as of 3.4.0.
@@ -1178,15 +1195,8 @@ struct obj *body;
     when += (long) (rnz(rot_adjust) - rot_adjust);
 
     if (is_rider(&mons[body->corpsenm])) {
-        /*
-         * Riders always revive.  They have a 1/3 chance per turn
-         * of reviving after 12 turns.  Always revive by 500.
-         */
         action = REVIVE_MON;
-        for (when = 12L; when < 500L; when++)
-            if (!rn2(3))
-                break;
-
+        when = rider_revival_time(body, FALSE);
     } else if (mons[body->corpsenm].mlet == S_TROLL && !no_revival) {
         long age;