[clang] Reapply [Clang][CodeGen] Use ptrtoaddr for pointer diff (#210729) (PR #221675)

[Mariya Podchishchaeva via cfe-commits]

Fznamznon wrote:

I think that broke CIR tests again, here is the fix https://github.com/llvm/llvm-project/pull/221703

https://github.com/llvm/llvm-project/pull/221675