[clang] [clang][SemaCXX] Fix crash caused by unresolved overloaded function type when using `__builtin_bit_cast` (PR #200574)

[Corentin Jabot via cfe-commits]

================
@@ -439,6 +439,13 @@ ExprResult Sema::ActOnBuiltinBitCastExpr(SourceLocation 
KWLoc, Declarator &D,
 ExprResult Sema::BuildBuiltinBitCastExpr(SourceLocation KWLoc,
                                          TypeSourceInfo *TSI, Expr *Operand,
                                          SourceLocation RParenLoc) {
+  if (Operand && Operand->getType()->isPlaceholderType()) {
----------------
cor3ntin wrote:

```suggestion
  if (Operand->hasPlaceholderType()) {
```

https://github.com/llvm/llvm-project/pull/200574
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