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Refactor FnDecl and FnSig non-type fields into a new wrapper type #### Why this Refactor? This PR is part of an initial cleanup for the [arg splat experiment](https://github.com/rust-lang/rust/issues/153629), but it's a useful refactor by itself. It refactors the non-type fields of `FnDecl`, `FnSig`, and `FnHeader` into a new packed wrapper types, based on this comment in the `splat` experiment PR: https://github.com/rust-lang/rust/pull/153697#discussion_r3004637413 It also refactors some common `FnSig` creation settings into their own methods. I did this instead of creating a struct with defaults. #### Relationship to `splat` Experiment I don't think we can use functional struct updates (`..default()`) to create `FnDecl` and `FnSig`, because we need the bit-packing for the `splat` experiment. Bit-packing will avoid breaking "type is small" assertions for commonly used types when `splat` is added. This PR packs these types: - ExternAbi: enum + `unwind` variants (38) -> 6 bits - ImplicitSelfKind: enum variants (5) -> 3 bits - lifetime_elision_allowed, safety, c_variadic: bool -> 1 bit #### Minor Changes Fixes some typos, and applies rustfmt to clippy files that got skipped somehow.
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.