Undo unnecessary changes

Author: Aaron1011

src/librustc_hir/def.rs

@@ -1,5 +1,5 @@
+use crate::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use crate::hir;
-use rustc_span::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 
 use rustc_macros::HashStable_Generic;
 use rustc_span::hygiene::MacroKind;