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d14d202262
Remove dead instructions in terminate blocks Terminate blocks look pretty in the IR I've looked at, so no actual perf delta from this. But it seems reasonable to note produce unused IR.
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.