Optimizations for Reverse Mode Autodiff

[mborland]

Looks like we should get a YouTube video covering this from CppCon 2025

https://cppcon2025.sched.com/event/27bO0/from-bayesian-inference-to-llms-modern-c++-optimizations-for-reversemode-automatic-differentiation

@demroz

[demroz]

very cool. I'll definitely check it out. The stan guys have been doing this for a very long time so it should be informative