[clang] [clang][PAC] Add __builtin_get_vtable_pointer (PR #139790)

[via cfe-commits]

================
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema 
&S, CallExpr *Call) {
   return Call;
 }
 
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+  if (S.checkArgCount(Call, 1))
+    return ExprError();
+  ExprResult ThisArg = S.DefaultFunctionArrayLvalueConversion(Call->getArg(0));
+  if (ThisArg.isInvalid())
+    return ExprError();
+  Call->setArg(0, ThisArg.get());
+  const Expr *Subject = Call->getArg(0);
----------------
cor3ntin wrote:

```suggestion
  const Expr *Subject = ThisArg.get();
```

https://github.com/llvm/llvm-project/pull/139790
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