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Matthias Krüger
8fb18d7ad8
Remove references to PassManagerBuilder This is a legacy PM concept that we no longer use.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.