Rollup merge of #105567 - TimNN:kcfi16, r=nikic

KCFI test: Also support LLVM 16 output

With a regex we can support the LLVM 16 output now already (and there are some third-party build bots that test Rust with LLVM head, like https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds?branch=master).

cc ```@rcvalle```

Author: matthiaskrgr