Voronoi, Hashing and OSL

Sergey from Blender asked me to look into why trying to manually sprinkle some SIMD into Cycles renderer Voronoi node code actually made things slower, and I started to look, and what I did in the end had nothing to do with SIMD whatsoever!
TL;DR: Blender 5.0 changed Voronoi node hash function to a faster one.
Voronoi in Blender Blender has a Voronoi node that can be used in any node based scenario (materials, compositor, geometry nodes).