Auto merge of #132301 - compiler-errors:adjust, r=lcnr

Remove region from adjustments

It's not necessary to store this region, because it's only used in THIR and MemCat/ExprUse, both of which already basically only deal with erased regions anyways.

compiler/rustc_trait_selection/src/error_reporting/infer/need_type_info.rs

@@ -551,10 +551,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                         ] => "",
                         [
                             ..,
-                            Adjustment {
-                                kind: Adjust::Borrow(AutoBorrow::Ref(_, mut_)),
-                                target: _,
-                            },
+                            Adjustment { kind: Adjust::Borrow(AutoBorrow::Ref(mut_)), target: _ },
                         ] => hir::Mutability::from(*mut_).ref_prefix_str(),
                         _ => "",
                     };