Apply suggestions from code review

Co-authored-by: Ralf Jung <post@ralfj.de>

Author: carbotaniuman

src/machine.rs

@@ -655,9 +655,8 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
         ecx: &mut InterpCx<'mir, 'tcx, Self>,
         ptr: Pointer<Self::PointerTag>,
     ) -> InterpResult<'tcx> {
-        let (tag, _) = ptr.into_parts();
+        let tag = ptr.provenance;
 
-        // We have a concrete pointer, so we don't need to reify it.
         if let Tag::Concrete(concrete) = tag {
             intptrcast::GlobalStateInner::expose_addr(ecx, concrete.alloc_id);
         }