2d4bac8675
This is another attempt to merge previously [reverted](https://github.com/llvm/llvm-project/pull/139474#issuecomment-3148339124) PR #139474. The added tests `narrowing-conversions-conditional-expressions.c[pp]` failed on [different (non x86_64) platforms](https://github.com/llvm/llvm-project/pull/139474#issuecomment-3148334280) because the expected warning is implementation-defined. That's why the test must explicitly specify target (the line `// RUN: -- -target x86_64-unknown-linux`).
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