[clang] [Clang][Basic] Enable `__has_feature(cfi)` (PR #151348)

[via cfe-commits]

moorabbit wrote:

> -fno-sanitize-ignorelist shouldn't be needed here. What errors were you originally seeing?

Here's the complete error message I get locally (CI shows the same):
```
clang: error: missing sanitizer ignorelist: '[...]/build/lib/clang/22/share/cfi_ignorelist.txt'
```

https://github.com/llvm/llvm-project/pull/151348