add missing potential_query_instability for keys and values in hashmap

Author: chenyukang

std/src/collections/hash/map.rs

@@ -356,6 +356,7 @@ impl<K, V, S> HashMap<K, V, S> {
     ///
     /// In the current implementation, iterating over keys takes O(capacity) time
     /// instead of O(len) because it internally visits empty buckets too.
+    #[rustc_lint_query_instability]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn keys(&self) -> Keys<'_, K, V> {
         Keys { inner: self.iter() }
@@ -417,6 +418,7 @@ impl<K, V, S> HashMap<K, V, S> {
     ///
     /// In the current implementation, iterating over values takes O(capacity) time
     /// instead of O(len) because it internally visits empty buckets too.
+    #[rustc_lint_query_instability]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn values(&self) -> Values<'_, K, V> {
         Values { inner: self.iter() }
@@ -449,6 +451,7 @@ impl<K, V, S> HashMap<K, V, S> {
     ///
     /// In the current implementation, iterating over values takes O(capacity) time
     /// instead of O(len) because it internally visits empty buckets too.
+    #[rustc_lint_query_instability]
     #[stable(feature = "map_values_mut", since = "1.10.0")]
     pub fn values_mut(&mut self) -> ValuesMut<'_, K, V> {
         ValuesMut { inner: self.iter_mut() }