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This is already CodegenResults without CrateInfo. The driver can calculate the CrateInfo and pass it by-ref to the backend. Using CompiledModules makes it a bit easier to move some other things out of the backend as will be necessary for moving LTO to the link phase.
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.