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0f81fca8ec
This fixes issues with RustAnalyzer not finding stable_mir crate. It is also part of the long term architecture plan for these crates, since we are moving towards having stable_mir depend on rustc_smir and not the other way around. I believe this is an utility function that will come handy eventually for stable_mir users, but I'm keeping it as part of rustc_internal since it initializes the StableMir context and requires `TyCtxt`. Finally, I added the rustc_internal crate under a feature since the APIs from this module shall not be stabilized.
The driver crate is effectively the "main" function for the rust
compiler. It orchestrates the compilation process and "knits together"
the code from the other crates within rustc. This crate itself does
not contain any of the "main logic" of the compiler (though it does
have some code related to pretty printing or other minor compiler
options).
For more information about how the driver works, see the rustc dev guide.