[llvm] [X86] Lower CTTZ/CTLZ vXi8 vectors using GF2P8AFFINEQB (PR #118012)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> Hey, is this PR still active? Or has it been superseded by another PR?

Its still active, but I got distracted by other things and never got back to it - I'll see if I can resurrect it.

https://github.com/llvm/llvm-project/pull/118012