Rollup merge of #137763 - compiler-errors:ty-nits, r=BoxyUwU

Use `mk_ty_from_kind` a bit less, clean up lifetime handling in borrowck

r? ``@BoxyUwU``

Pulled out of my attempt to turn that `*const dyn Tr + '_` casting into a lint (which failed lmao)

compiler/rustc_middle/src/ty/codec.rs

@@ -224,7 +224,7 @@ impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for Ty<'tcx> {
             })
         } else {
             let tcx = decoder.interner();
-            tcx.mk_ty_from_kind(rustc_type_ir::TyKind::decode(decoder))
+            tcx.mk_ty_from_kind(ty::TyKind::decode(decoder))
         }
     }
 }

compiler/rustc_middle/src/ty/sty.rs

@@ -462,7 +462,7 @@ impl<'tcx> Ty<'tcx> {
 
     #[inline]
     pub fn new_param(tcx: TyCtxt<'tcx>, index: u32, name: Symbol) -> Ty<'tcx> {
-        tcx.mk_ty_from_kind(Param(ParamTy { index, name }))
+        Ty::new(tcx, Param(ParamTy { index, name }))
     }
 
     #[inline]