add a rustc::query_stability lint

compiler/rustc_interface/src/lib.rs

@@ -6,6 +6,7 @@
 #![feature(nll)]
 #![feature(once_cell)]
 #![recursion_limit = "256"]
+#![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
 
 mod callbacks;
 pub mod interface;