[clang] Revert "[Clang][CodeGen] Use ptrtoaddr for pointer diff (#210729)" (PR #219203)

[Erich Keane via cfe-commits]

erichkeane wrote:

FYI: These have been a touch noisy to CIR?  If this relands, it would be appreciated if the CIR tests were updated as well, see:  https://github.com/llvm/llvm-project/pull/219491

https://github.com/llvm/llvm-project/pull/219203