ported fix for CUDD existsAbstractRepresentative from Philip's branch to game-branch

Former-commit-id: 5841f78c33

resources/3rdparty/cudd-3.0.0/cudd/cuddBddAbs.c

@@ -542,12 +542,27 @@ cuddBddExistAbstractRepresentativeRecur(
         if (cube == one) {
             //            printf("return in preprocessing...\n");
             return one;
+        } else {
+            res = cuddBddExistAbstractRepresentativeRecur(manager, f, cuddT(cube));
+            if (res == NULL) {
+                return(NULL);
+            }
+            cuddRef(res);
+            
+            res1 = cuddBddIteRecur(manager, manager->vars[cube->index], zero, res);
+            if (res1 == NULL) {
+                Cudd_IterDerefBdd(manager,res);
+                Cudd_IterDerefBdd(manager,zero);
+                return(NULL);
+            }
+            cuddDeref(res);
+            return(res1);
         }
     } else if (cube == one) {
         //        printf("return in preprocessing...\n");
         return f;
     }
-    /* From now on, cube is non-constant, but f might be constant. */
+    /* From now on, cube and f are non-constant. */
     
 //    printf("F perm %i and cube perm %i\n", manager->perm[F->index], manager->perm[cube->index]);