* YJIT: implement call fuzzer script

Attempt to detect bugs in YJIT call implementation.

* Add basic checks for rest, kwrest. Impprove formatting.

* Refactor call fuzzer to make it more powerful and maintainable

Compute checksum of arguments

* Fix checksum computation. Add useless locals as sussged by Alan.

* Add some useless if statements

* Add arguments of different types

* Pass object arguments as well. Force different shapes.

* Compute fuzzing time/speed

* Make use of block param