[llvm] [BasicAA] Treat returns_twice functions as clobbering unescaped objects (PR #117902)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

The fact that we don't represent longjmp control flow with a real CFG edge continues to make me worry about hidden bugs, but this particular fix seems reasonable.

https://github.com/llvm/llvm-project/pull/117902