[llvm] [X86] Drop instruction prefetch with unsupported operands in LowerPREFETCH (PR #225826)

[Demetrios Chiuratto Agourakis via llvm-commits]

agourakis82 wrote:

Thanks for the review, @phoebewang! I don't have commit access yet. Could you merge this on my behalf when convenient?

https://github.com/llvm/llvm-project/pull/225826