[clang] [llvm] [clang][CodeGen] Generate follow-up metadata for loops in correct format (PR #131985)

[Ryotaro Kasuga via cfe-commits]

kasuga-fj wrote:

Printing an error message looks reasonable to me, but I think we first need to clarify what codes are "unsupported".

https://github.com/llvm/llvm-project/pull/131985