[llvm] [LoopIdiom] Use costing to determine CRC strategy (PR #211040)

[Piotr Fusik via llvm-commits]

pfusik wrote:

> AMD EPYC 9654, x86_64 (using current version of #211113):

It looks like it fixes TC=16, but breaks TC=32.

https://github.com/llvm/llvm-project/pull/211040