llvm-project

9ba6961c - Reapply "[clang][dataflow] Model conditional operator correctly." with fixes (#89596)

Reapply "[clang][dataflow] Model conditional operator correctly." with fixes (#89596) I reverted https://github.com/llvm/llvm-project/pull/89213 beause it was causing buildbots to fail with assertion failures. Embarrassingly, it turns out I had been running tests locally in `Release` mode, i.e. with `assert()` compiled away. This PR re-lands #89213 with fixes for the failing assertions.