BUG #16136: Bug with cost calculation and JIT application

The following bug has been logged on the website:

Bug reference:      16136
Logged by:          Александр Филиппенко
Email address:      alexfilus@gmail.com
PostgreSQL version: 12.1
Operating system:   Ubuntu 18.04
Description:

I had very strange behaviour of optimizator.
https://explain.depesz.com/s/GcHL
https://explain.depesz.com/s/sTyG
Both explains are for same query and same data set, but in second case I
turn off JIT. I guess it's because of wrong cost calculation like this
Nested Loop  (cost=463.86..5575122.76 rows=652 width=74) (actual
time=9.685..67.713 rows=18 loops=1)