fixup! Don't visit foreign function bodies when lowering ast to hir

Author: ayazhafiz

src/librustc_ast_lowering/item.rs

@@ -7,7 +7,6 @@ use rustc_ast::attr;
 use rustc_ast::node_id::NodeMap;
 use rustc_ast::ptr::P;
 use rustc_ast::visit::{self, AssocCtxt, FnCtxt, FnKind, Visitor};
-use rustc_ast::walk_list;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::struct_span_err;
 use rustc_hir as hir;