[clang] [llvm] [Clang] Fix assertion failure when passing wide string literal to __builtin_nanf (PR #205452)

[Corentin Jabot via cfe-commits]

================
@@ -20076,7 +20076,11 @@ static bool TryEvaluateBuiltinNaN(const ASTContext 
&Context,
                                   bool SNaN,
                                   llvm::APFloat &Result) {
   const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts());
-  if (!S) return false;
+  if (!S)
+    return false;
+
+  if (!S->isOrdinary() && !S->isUTF8())
----------------
cor3ntin wrote:

```suggestion
  if (!S->isOrdinary())
```

https://github.com/llvm/llvm-project/pull/205452
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