Rename mir::Mir to mir::Body, by analogy with hir::Body.

[eddyb]

I think it would make more sense than the current setup, as a Mir coresponds to the body of a constant or function, in MIR.
Also, MIR encompasses more than just bodies - e.g. the miri value representation, but arguably the whole type/trait-system (including chalk) could be considered an integral part of "the Mid-level rustc IR".

• rename the types (done in Changes the type mir::Mir into mir::Body #60928)
• rename variable, argument and field names to mir_body where it used to be mir

cc @rust-lang/compiler

[marimeireles]

Hi @eddyb can I take this one this one to get my feet wet on rust?

[nikomatsakis]

I feel pretty good about this naming. As far as process, I feel like we could probably make this specific decision rather quickly. We could also try to have a dedicated nomenclature discussion, where we look over a lot of names and try to "harmonize" them, rather than doing things piecemeal. But this particular choice feels like a clear win.

[eddyb]

@marimeireles Sure, go ahead!

[imbrem]

Could I try part 2 of this, or is it already taken?