skip debug dep node code in non-incremental mode

Author: zetanumbers

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -808,7 +808,10 @@ impl<D: Deps> DepGraph<D> {
     where
         F: FnOnce() -> String,
     {
-        let dep_node_debug = &self.data.as_ref().unwrap().dep_node_debug;
+        let Some(data) = &self.data.as_ref() else {
+            return;
+        };
+        let dep_node_debug = &data.dep_node_debug;
 
         if dep_node_debug.borrow().contains_key(&dep_node) {
             return;

compiler/rustc_session/src/session.rs

@@ -307,6 +307,7 @@ impl Session {
     pub fn record_trimmed_def_paths(&self) {
         if self.opts.unstable_opts.print_type_sizes
             || self.opts.unstable_opts.query_dep_graph
+            || self.opts.unstable_opts.incremental_info
             || self.opts.unstable_opts.dump_mir.is_some()
             || self.opts.unstable_opts.unpretty.is_some()
             || self.opts.output_types.contains_key(&OutputType::Mir)