[clang] [CIR] Don't generate ClangIR after an unrecoverable error occured (PR #130971)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

This looks good, I don't think we really need a test for it.  We have to make sure we get this in EVERY one of the external interfaces unfortunately (as they are added), but LGTM.

https://github.com/llvm/llvm-project/pull/130971