[clang] [clang-tools-extra] [clang]: Propagate `*noreturn` attributes in `CFG` (PR #146355)

[Balazs Benics via cfe-commits]

steakhal wrote:

I don't think I'll any time to contribute to this PR: doing reviews or upstream an alternative implementation.
To be transparent, I didn't ask for permission no matter if it would be approved, I'd not be able to commit myself.
I resign from the review. Sorry that I incidentally blocked this PR so far.

https://github.com/llvm/llvm-project/pull/146355