Rollup merge of #79951 - LeSeulArtichaut:ty-ir, r=nikomatsakis

Refractor a few more types to `rustc_type_ir`

In the continuation of #79169, ~~blocked on that PR~~.

This PR:
 - moves `IntVarValue`, `FloatVarValue`, `InferTy` (and friends) and `Variance`
 - creates the `IntTy`, `UintTy` and `FloatTy` enums in `rustc_type_ir`, based on their `ast` and `chalk_ir` equilavents, and uses them for types in the rest of the compiler.

~~I will split up that commit to make this easier to review and to have a better commit history.~~
EDIT: done, I split the PR in commits of 200-ish lines each

r? `````@nikomatsakis````` cc `````@jackh726`````
This commit is contained in:
Yuki Okushi 2021-01-28 15:09:02 +09:00 committed by GitHub
commit 446edd1e1a
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46 changed files with 818 additions and 565 deletions

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@ -1,4 +1,4 @@
use rustc_ast::{FloatTy, InlineAsmTemplatePiece, IntTy, UintTy};
use rustc_ast::InlineAsmTemplatePiece;
use rustc_errors::struct_span_err;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
@ -7,7 +7,7 @@ use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
use rustc_index::vec::Idx;
use rustc_middle::ty::layout::{LayoutError, SizeSkeleton};
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_middle::ty::{self, FloatTy, IntTy, Ty, TyCtxt, UintTy};
use rustc_session::lint;
use rustc_span::{sym, Span, Symbol, DUMMY_SP};
use rustc_target::abi::{Pointer, VariantIdx};