[clang] [Clang]Throw frontend error for target feature mismatch when using flatten attribute (PR #154801)

[Abhishek Kaushik via cfe-commits]

abhishek-kaushik22 wrote:

The failing test looks unrelated to this change
```
Failed Tests (1):
  lldb-api :: 
functionalities/data-formatter/data-formatter-stl/generic/forward_list/TestDataFormatterGenericForwardList.py
```

https://github.com/llvm/llvm-project/pull/154801
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