Reformat using the new identifier sorting from rustfmt

compiler/rustc_ast_lowering/src/index.rs

@@ -6,7 +6,7 @@ use rustc_hir::*;
 use rustc_index::IndexVec;
 use rustc_middle::span_bug;
 use rustc_middle::ty::TyCtxt;
-use rustc_span::{Span, DUMMY_SP};
+use rustc_span::{DUMMY_SP, Span};
 use tracing::{debug, instrument};
 
 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.