Auto merge of #79318 - cjgillot:fitem, r=lcnr

Store HIR ForeignItem in a side table

In a similar fashion to Item, ImplItem and TraitItem.

compiler/rustc_interface/src/proc_macro_decls.rs

@@ -33,6 +33,8 @@ impl<'v> ItemLikeVisitor<'v> for Finder<'_> {
     fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem<'_>) {}
 
     fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem<'_>) {}
+
+    fn visit_foreign_item(&mut self, _foreign_item: &hir::ForeignItem<'_>) {}
 }
 
 pub(crate) fn provide(providers: &mut Providers) {