rust/compiler
bors 48691ea6e6 Auto merge of #83185 - jyn514:remove-dead-code, r=oli-obk
Remove (lots of) dead code

Builds on
- [ ] https://github.com/rust-lang/rust/pull/83161
- [x] https://github.com/rust-lang/rust/pull/83230
- [x] https://github.com/rust-lang/rust/pull/83197.

Found with https://github.com/est31/warnalyzer.
See https://github.com/rust-lang/rust/pull/77739 for a similar change in the past.

Dubious changes:
- Maybe some of the dead code in rustc_data_structures should be kept, in case someone wants to use it in the future?

TODO:
- [ ] check if any of the comments on the deleted code should be kept.
- [x] update the compiler documentation; right now it fails to build
- [x] finish moving `cfg(test)` changes into https://github.com/rust-lang/rust/pull/83197

cc `@est31`
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