[clang] -ast-dump-decl-types crashes on codes involving concepts #94928 (PR #108142)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> > Also, please add the example code from the linked issue to `ast-dump-concepts.cpp` so that we more clearly demonstrate that the issue was fixed.
> 
> Hi @AaronBallman The example code provided by @zyn0217 has already in the `ast-dump-concepts.cpp`.

Ah, I missed it because the code was split up in the file. Thanks!

https://github.com/llvm/llvm-project/pull/108142