Add to https://github.com/kostya/benchmarks/

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I'm fully aware XL undergoes a big "merging" of all the diverse efforts emerging throughout the last 10-15 years and that it also has some sharp edges.

It's though already very capable and it definitely makes sense to keep an eye also on the performance side (both speed of debug build compilation /assuming unoptimized debug build by default for subsecond compilation and production build upon explicit request/ and the running speed of the resulting binary).

Currently the most curated and maintained "generic" benchmark is https://github.com/kostya/benchmarks/ . It'd be great to see XL there as well (the production build of course).