add different color for cleanup nodes in dark mode

Author: vn-ki

compiler/rustc_mir/src/util/generic_graph.rs

@@ -41,7 +41,8 @@ fn bb_to_graph_node(block: BasicBlock, body: &Body<'_>, dark_mode: bool) -> Node
     let label = node(def_id, block);
 
     let (title, bgcolor) = if data.is_cleanup {
-        (format!("{} (cleanup)", block.index()), "lightblue")
+        let color = if dark_mode { "royalblue" } else { "lightblue" };
+        (format!("{} (cleanup)", block.index()), color)
     } else {
         let color = if dark_mode { "dimgray" } else { "gray" };
         (format!("{}", block.index()), color)