Remove NodeIdHashingMode.

compiler/rustc_span/src/hygiene.rs

@@ -117,7 +117,7 @@ fn assert_default_hashing_controls<CTX: HashStableContext>(ctx: &CTX, msg: &str)
         // `-Z incremental-ignore-spans` option. Normally, this option is disabled,
         // which will cause us to require that this method always be called with `Span` hashing
         // enabled.
-        HashingControls { hash_spans, node_id_hashing_mode: _ }
+        HashingControls { hash_spans }
             if hash_spans == !ctx.debug_opts_incremental_ignore_spans() => {}
         other => panic!("Attempted hashing of {msg} with non-default HashingControls: {:?}", other),
     }