[clang] [CIR] Add newly implemented defer stmt class to nyi (PR #171773)

[Amr Hesham via cfe-commits]

https://github.com/AmrDeveloper requested changes to this pull request.

Thanks for handling it.

I think from the OGCG it should be added to a different section that will have `llvm_unrecable`, not NYI

https://github.com/llvm/llvm-project/blob/fbc121ce1ee398176bdfeb482b0549e03a2bb5c8/clang/lib/CodeGen/CGStmt.cpp#L117

https://github.com/llvm/llvm-project/pull/171773