module IR code is not dumped on exit in kaleidoscope example

[Documentation](https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/LangImpl03.html#driver-changes-and-closing-thoughts) states that on `^D` on `Linux`(I checked on `MacOS`) the llvm module should [dump](https://github.com/llvm/llvm-project/blob/main/llvm/examples/Kaleidoscope/Chapter3/toy.cpp#L619) all generated `IR` code. It seems that somehow the code is flushed off before being printed, the only output is something like:
```
; ModuleID = 'global_module'
source_filename = "global_module"
```

The workaround was to implement a more deterministic program exit [control](https://github.com/popescun/Learning/blob/main/llvm/kaleidoscope/ast.cpp#L559) using a predefined input token, e.g. `exit`.

Start with the Kaleidoscope documentation section on driver changes and the linked llvm/examples/Kaleidoscope/Chapter3/toy.cpp around line 619. Reproduce the ^D exit behavior on the example and inspect how generated IR is emitted during shutdown. Done means the documented EOF path dumps the generated module rather than only its header.

Written by the indexing model from the issue text.