do not allow rustc::pass_by_value lint

Author: BoxyUwU

Diff for: compiler/rustc_middle/src/mir/visit.rs

@@ -192,10 +192,9 @@ macro_rules! make_mir_visitor {
                 self.super_constant(constant, location);
             }
 
-            #[allow(rustc::pass_by_value)]
             fn visit_ty_const(
                 &mut self,
-                ct: & $($mutability)? ty::Const<'tcx>,
+                ct: $( & $mutability)? ty::Const<'tcx>,
                 location: Location,
             ) {
                 self.super_ty_const(ct, location);
@@ -636,7 +635,7 @@ macro_rules! make_mir_visitor {
 
                     Rvalue::Repeat(value, ct) => {
                         self.visit_operand(value, location);
-                        self.visit_ty_const(ct, location);
+                        self.visit_ty_const($(&$mutability)? *ct, location);
                     }
 
                     Rvalue::ThreadLocalRef(_) => {}
@@ -888,16 +887,15 @@ macro_rules! make_mir_visitor {
                 self.visit_span($(& $mutability)? *span);
                 drop(user_ty); // no visit method for this
                 match literal {
-                    ConstantKind::Ty(ct) => self.visit_ty_const(ct, location),
+                    ConstantKind::Ty(ct) => self.visit_ty_const($(&$mutability)? *ct, location),
                     ConstantKind::Val(_, ty) => self.visit_ty($(& $mutability)? *ty, TyContext::Location(location)),
                     ConstantKind::Unevaluated(_, ty) => self.visit_ty($(& $mutability)? *ty, TyContext::Location(location)),
                 }
             }
 
-            #[allow(rustc::pass_by_value)]
             fn super_ty_const(
                 &mut self,
-                _ct: & $($mutability)? ty::Const<'tcx>,
+                _ct: $(& $mutability)? ty::Const<'tcx>,
                 _location: Location,
             ) {