Handle rustc_query_system cases of rustc::potential_query_instability lint

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -1424,6 +1424,8 @@ fn panic_on_forbidden_read<D: Deps>(data: &DepGraphData<D>, dep_node_index: DepN
         && let Some(nodes) = &data.current.nodes_in_current_session
     {
         // Try to find it among the nodes allocated so far in this session
+        // This is OK, there's only ever one node result possible so this is deterministic.
+        #[allow(rustc::potential_query_instability)]
         if let Some((node, _)) = nodes.lock().iter().find(|&(_, index)| *index == dep_node_index) {
             dep_node = Some(*node);
         }

compiler/rustc_query_system/src/dep_graph/serialized.rs

@@ -719,6 +719,8 @@ impl<D: Deps> GraphEncoder<D> {
         let mut status = self.status.lock();
         let status = status.as_mut().unwrap();
         if let Some(record_stats) = &status.stats {
+            // `stats` is sorted below so we can allow this lint here.
+            #[allow(rustc::potential_query_instability)]
             let mut stats: Vec<_> = record_stats.values().collect();
             stats.sort_by_key(|s| -(s.node_counter as i64));
 

compiler/rustc_query_system/src/lib.rs

@@ -1,5 +1,5 @@
 // tidy-alphabetical-start
-#![allow(rustc::potential_query_instability, internal_features)]
+#![allow(internal_features)]
 #![cfg_attr(bootstrap, feature(let_chains))]
 #![feature(assert_matches)]
 #![feature(core_intrinsics)]

compiler/rustc_query_system/src/query/job.rs

@@ -510,6 +510,10 @@ pub fn break_query_cycles<I: Clone + Debug>(
     registry: &rayon_core::Registry,
 ) {
     let mut wakelist = Vec::new();
+    // It is OK per the comments:
+    // - https://github.com/rust-lang/rust/pull/131200#issuecomment-2798854932
+    // - https://github.com/rust-lang/rust/pull/131200#issuecomment-2798866392
+    #[allow(rustc::potential_query_instability)]
     let mut jobs: Vec<QueryJobId> = query_map.keys().cloned().collect();
 
     let mut found_cycle = false;