[clang] [Clang] Fix Sema::checkArgCount for 0-arg functions (PR #139638)

[Mariya Podchishchaeva via cfe-commits]

================
@@ -52,7 +52,7 @@ static bool CheckWasmBuiltinArgIsInteger(Sema &S, CallExpr *E,
 }
 
 bool SemaWasm::BuiltinWasmRefNullExtern(CallExpr *TheCall) {
-  if (TheCall->getNumArgs() != 0)
+  if (SemaRef.checkArgCount(TheCall, 0))
----------------
Fznamznon wrote:

```suggestion
  if (SemaRef.checkArgCount(TheCall, /*DesiredArgCount=*/ 0))
```

https://github.com/llvm/llvm-project/pull/139638