[clang] [clang][Analyzer] Fix error path of builtin overflow (PR #136345)

[Balazs Benics via cfe-commits]

https://github.com/steakhal requested changes to this pull request.

The tests and functionality looks correct to me.
I noticed you promptly fixed the linked issue. You shouldn't need to feel pressured for a fix right away.
I appreciate your swiftness and enthausiesm.

https://github.com/llvm/llvm-project/pull/136345