rustdoc: Get symbol for `TyParam` directly

src/librustdoc/clean/utils.rs

@@ -414,7 +414,7 @@ fn print_const_with_custom_print_scalar(tcx: TyCtxt<'_>, ct: &'tcx ty::Const<'tc
             return Generic(kw::SelfUpper);
         }
         Res::Def(DefKind::TyParam, _) if path.segments.len() == 1 => {
-            return Generic(Symbol::intern(&path.whole_name()));
+            return Generic(path.segments[0].name);
         }
         Res::SelfTy(..) | Res::Def(DefKind::TyParam | DefKind::AssocTy, _) => true,
         _ => false,