add new rval, pull deref early

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -446,6 +446,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
             Rvalue::ThreadLocalRef(_) => self.check_op(ops::ThreadLocalAccess),
 
             Rvalue::Use(_)
+            | Rvalue::CopyForDeref(..)
             | Rvalue::Repeat(..)
             | Rvalue::Discriminant(..)
             | Rvalue::Len(_)

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

@@ -260,6 +260,8 @@ where
             in_place::<Q, _>(cx, in_local, place.as_ref())
         }
 
+        Rvalue::CopyForDeref(place) => in_place::<Q, _>(cx, in_local, place.as_ref()),
+
         Rvalue::Use(operand)
         | Rvalue::Repeat(operand, _)
         | Rvalue::UnaryOp(_, operand)

compiler/rustc_const_eval/src/transform/check_consts/resolver.rs

@@ -199,6 +199,7 @@ where
             mir::Rvalue::Cast(..)
             | mir::Rvalue::ShallowInitBox(..)
             | mir::Rvalue::Use(..)
+            | mir::Rvalue::CopyForDeref(..)
             | mir::Rvalue::ThreadLocalRef(..)
             | mir::Rvalue::Repeat(..)
             | mir::Rvalue::Len(..)