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

[Abhishek Kaushik via cfe-commits]

abhishek-kaushik22 wrote:

@efriedma-quic @AaronBallman Can you please review this one? I messed up the 
last pr

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