[clang] [clang][CodeGen] Promote point of GRO(CWG2563) (PR #151067)

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 commented:

The conversion related part looks slightly anti-pattern and slightly smells dangerous. Can we try to avoid emitting the conversion part if conversion won't happen and only emit if the conversion will happen?

https://github.com/llvm/llvm-project/pull/151067