[llvm] [X86] check test changes due to legalising funnel shifts (PR #186673)

[Gergo Stomfai via llvm-commits]

stomfaig wrote:

By "non-constant funnels" do you mean the CL ones?

If that is okay with you, I'd not include them in this patch, as they will likely be quite messy and often won't improve performance even if the funnel shifts are actually faster. 

This is because we'd need to compute BW-Imm into CL, as well, and the the second or has to be serialised.  

https://github.com/llvm/llvm-project/pull/186673