[llvm] [CostModel] Mark ssa_copy as free (PR #75294)

[Florian Hahn via llvm-commits]

fhahn wrote:

I am curious if you encountered cases where those intrinsics are still around after the middle-end optimization pipeline. I think all users of those intrinsics should clean them up, but there might be some places that got missed.

https://github.com/llvm/llvm-project/pull/75294