Auto merge of #61062 - mark-i-m:mono-mv, r=eddyb,oli-obk

Remove _all_ codegen dependencies on `rustc_mir` :tada:

~This code is pretty self-contained. It has no references to the rest of `rustc_mir`. Moving it to its own crate means that almost all of the references from `rustc_codegen_*` to `rustc_mir` are instead moved to `rustc_monomorphize`, which should help improve compile times for the compiler a bit...~

With the help of eddyb and oli-obk, all of the dependencies of `librustc_codegen_*` on `librustc_mir` have been removed:
- dependencies on `rustc_mir::monomorphize` were moved to `rustc::mir::mono`
- `rustc_mir::const_eval::const_field` is made into a query.
- `rustc_mir::interpret::type_name` is made into a query.

This should help reduce compile time when working on `rustc_mir` :clock1:

cc #47849

r? @eddyb

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