rustc_mir: add missing subst_from_frame_and_normalize_erasing_regions calls.

Author: eddyb

src/librustc_mir/interpret/operand.rs

@@ -522,7 +522,10 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             Move(ref place) =>
                 self.eval_place_to_op(place, layout)?,
 
-            Constant(ref constant) => self.eval_const_to_op(constant.literal, layout)?,
+            Constant(ref constant) => {
+                let val = self.subst_from_frame_and_normalize_erasing_regions(constant.literal);
+                self.eval_const_to_op(val, layout)?
+            }
         };
         trace!("{:?}: {:?}", mir_op, *op);
         Ok(op)