Updated compiler-benchmark

[Per Nordlöw]

On Thursday, 16 July 2020 at 18:27:54 UTC, jmh530 wrote:
> How are the functions generated? I see something about 
> function-depth, but it might be good to have an example in the 
> readme.

This is, of course, a very contrived benchmark but I had to pick 
something to get me started and I'll happily receive suggestions 
on how to improve the benchmarking-relevance of the generated 
code.