[clang] [Clang][AArch64] Include SME attributes in the name mangling of function types (PR #114209)

[Sander de Smalen via cfe-commits]

================
@@ -3536,35 +3536,64 @@ void CXXNameMangler::mangleExtFunctionInfo(const 
FunctionType *T) {
   // FIXME: noreturn
 }
 
-bool hasSharedState(unsigned SMEAttrs) {
+unsigned getZAState(unsigned SMEAttrs) {
   switch (SMEAttrs) {
   case FunctionType::ARM_In:
+    return 1;
   case FunctionType::ARM_Out:
+    return 2;
   case FunctionType::ARM_InOut:
+    return 3;
   case FunctionType::ARM_Preserves:
-    return true;
+    return 4;
   default:
-    return false;
+    return 0;
----------------
sdesmalen-arm wrote:

I think only `case ARM_None` should return 0. Any other value (default) should 
be an `llvm_unreachable`.

https://github.com/llvm/llvm-project/pull/114209
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