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

[Sander de Smalen via cfe-commits]

================
@@ -3535,6 +3536,74 @@ void CXXNameMangler::mangleExtFunctionInfo(const FunctionType *T) {
   // FIXME: noreturn
 }
 
+enum SMEState {
+  Normal = 0,
+  SM_Enabled = 1 << 0,
+  SM_Compatible = 1 << 1,
+  ZA_Agnostic = 1 << 2,
+  ZA_Shift = 3,
+  ZT0_Shift = 6,
----------------
sdesmalen-arm wrote:

```suggestion
  ArmStreamingBit = 1 << 0,
  ArmStreamingCompatibleBit = 1 << 1,
  ArmAgnosticSMEZAStateBit << 2,
  ZA_Shift = 3,
  ZT0_Shift = 6,
```

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