[clang] [AArch64][SME] Add diagnostics to CheckConstexprFunctionDefinition (PR #121777)

[Kerry McLaughlin via cfe-commits]

================
@@ -1854,6 +1855,9 @@ bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD,
     }
   }
 
+  if (Context.getTargetInfo().getTriple().isAArch64())
+    ARM().CheckSMEFunctionDefAttributes(NewFD);
+
----------------
kmclaughlin-arm wrote:

Thanks, `ActOnStartOfLambdaDefinition` does seem like a better place to check the attributes.

https://github.com/llvm/llvm-project/pull/121777