[clang] [clang][CodeGen] Fix in codegen for __builtin_popcountg/ctzg/clzg (PR #90845)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic approved this pull request.

Please fix clang-format warnings.  Otherwise LGTM

https://github.com/llvm/llvm-project/pull/90845