[llvm] [LoopIdiomRecognizer] Implement CRC recognition (PR #79295)

[Mikhail Gudim via llvm-commits]

mgudim wrote:

> > @joe-img I am going to review this properly, but now I am pretty busy with other work. Please ping me in a 2 weeks, if I haven't reviewed before, sorry for the long wait.
> 
> Ping : )

Thanks for the reminder. I'm in the process.

https://github.com/llvm/llvm-project/pull/79295