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

[Paul Osmialowski via cfe-commits]

pawosm-arm wrote:

One thing that worries me is that before this commit, there was no ICE caused by compiling this snippet of code (regardless its validity or usefulness), and now there is. It would be great if it could print a normal error message (which would encourage my resistant colleagues to rewrite the code), rather than seeing segfault which triggers the 'fix the compiler' demands.

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