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Introduce `Unnormalized` wrapper This is the first step of the [eager normalization](https://rust-lang.zulipchat.com/#narrow/channel/364551-t-types.2Ftrait-system-refactor/topic/Eager.20normalization.2C.20ahoy.21/with/582996293) series. This PR introduce an `Unnormalized` wrapper and make most normalization routines consume it. The purpose is to make normalization explicit. This PR contains no behavior change. API changes are in the first two commit. There're some normalization routines left untouched: - `normalize` in the type checker of borrowck: better do it together with `field.ty()` returning `Unnormalized`. - `normalize_with_depth`: only used inside the old solver. Can be done later. - `query_normalize`: rarely used. - misc local normalization helpers. The compiler errors are mostly fixed via `ast-grep`, with exceptions handled manually.
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.