[clang] [Clang][AArch64] Add missing SME functions to header file. (PR #75791)

[Sander de Smalen via cfe-commits]

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@@ -10570,6 +10570,26 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
     return Builder.CreateCall(F, llvm::ConstantInt::get(Int32Ty, HintID));
   }
 
+  if (BuiltinID == clang::AArch64::BI__builtin_arm_get_sme_state) {
+    // Create call to __arm_sme_state and store the results to the two pointers.
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sdesmalen-arm wrote:

It could call `__arm_sme_state` directly, but we don't expose the special calling convention for __arm_sme_state with an attribute at the C level, hence the indirection through a builtin.

https://github.com/llvm/llvm-project/pull/75791