[llvm] [clang] [Clang][SME] Detect always_inline used with mismatched streaming attributes (PR #77936)

[Sander de Smalen via cfe-commits]

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sdesmalen-arm wrote:

It seems wrong to move the header files to llvm/include/llvm/Support, but to leave the implementation in llvm/lib/AArch64 (which ends up in a different library). If you move the corresponding .cpp file to llvm/lib/Support then you don't need to link with `AArch64Utils`.

https://github.com/llvm/llvm-project/pull/77936