[clang] [C23] Fix typeof handling in enum declarations (PR #146394)

[via cfe-commits]

Sirraide wrote:

Since we’re on to C++ support now, here’s one more fun case:
```c++
class A {}; A a;
class B : typeof(A) {};
class C : typeof(a) {};
```

https://github.com/llvm/llvm-project/pull/146394