support unbound refs in inline pass

[tjjfvi]

No description provided.

[HigherOrderBot]

Perf run for 9f686b6:

file              mode        main          9f686b650332
========================================================
sum_rec           intr-singl      14.057 s      13.939 s
                  intr-multi       7.283 s       7.192 s
--------------------------------------------------------
bitonic_sort_lam  intr-singl      11.487 s      11.587 s
                  intr-multi       5.670 s       5.719 s
--------------------------------------------------------
merge_sort        intr-singl       7.602 s       7.589 s
                  intr-multi       3.772 s       3.810 s
--------------------------------------------------------
sum_tail          intr-singl       1.175 s       1.185 s
                  intr-multi       1.167 s       1.160 s
--------------------------------------------------------
c2                intr-singl       0.000 s       0.000 s
                  intr-multi       0.001 s       0.001 s
--------------------------------------------------------
sum_tree          intr-singl       9.437 s       9.388 s
                  intr-multi       4.439 s       4.415 s
--------------------------------------------------------
boom              intr-singl       2.299 s       2.262 s
                  intr-multi       2.545 s       1.496 s
--------------------------------------------------------
radix_sort_lam    intr-singl       9.473 s       9.621 s
                  intr-multi       4.833 s       4.755 s