Auto merge of #134443 - joshtriplett:use-field-init-shorthand, r=lqd,tgross35,nnethercote

Use field init shorthand where possible

Field init shorthand allows writing initializers like `tcx: tcx` as
`tcx`. The compiler already uses it extensively. Fix the last few places
where it isn't yet used.

EDIT: this PR also updates `rustfmt.toml` to set
`use_field_init_shorthand = true`.

compiler/rustc_lint/src/impl_trait_overcaptures.rs

@@ -177,7 +177,7 @@ fn check_fn(tcx: TyCtxt<'_>, parent_def_id: LocalDefId) {
         // Lazily compute these two, since they're likely a bit expensive.
         variances: LazyCell::new(|| {
             let mut functional_variances = FunctionalVariances {
-                tcx: tcx,
+                tcx,
                 variances: FxHashMap::default(),
                 ambient_variance: ty::Covariant,
                 generics: tcx.generics_of(parent_def_id),