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92bad93f06
Misc LTO cleanups Follow up to https://github.com/rust-lang/rust/pull/145955. * Remove want_summary argument from `prepare_thin`. Since https://github.com/rust-lang/rust/pull/133250 ThinLTO summary writing is instead done by `llvm_optimize`. * Two minor cleanups
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.