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Remove unused intercrate dependencies Checked by enabling `-Wunused-crate-dependencies` `driver_impl` still depends on `index` to forward the `rustc_randomized_layouts` feature, and `rustc_main` depends on several unused crates for sysroot reasons r? compiler
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.