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[Clang][AArch64] Emit 'unimplemented' diagnostic for SME (#80295)
When a function F has ZA and ZT0 state, calls another function G that only shares ZT0 state with its caller, F will have to save ZA before the call to G, and restore it afterwards (rather than setting up a lazy-sve). This is not yet implemented in LLVM and does not result in a compile-time error either. So instead of silently generating incorrect code, it's better to emit an error saying this is not yet implemented.
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