Remove workaround in reachable_items

kani-compiler/src/kani_middle/reachability.rs

@@ -153,11 +153,7 @@ impl<'tcx> MonoItemsCollector<'tcx> {
  /// instruction looking for the items that should be included in the compilation.
  fn reachable_items(&mut self) {
  while let Some(to_visit) = self.queue.pop() {
- // TODO: This should only check is_foreign_item() or even `has_body()`.
- // We need https://github.com/rust-lang/rust/pull/118681 to land first.
- if !self.collected.contains(&to_visit)
- && !self.tcx.is_foreign_item(rustc_internal::internal(to_visit.clone()).def_id())
- {
+ if !self.tcx.is_foreign_item(rustc_internal::internal(to_visit.clone()).def_id()) {
  self.collected.insert(to_visit.clone());
  let next_items = match &to_visit {
  MonoItem::Fn(instance) => self.visit_fn(*instance),