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

[Aaron Ballman via cfe-commits]

AaronBallman 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) {};
> ```

Good test cases, but let's handle C++ separately to keep the patch reasonable?


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