Rollup merge of #89558 - lcnr:query-stable-lint, r=estebank

Add rustc lint, warning when iterating over hashmaps

r? rust-lang/wg-incr-comp

compiler/rustc_infer/src/lib.rs

@@ -24,6 +24,7 @@
 #![feature(min_specialization)]
 #![feature(label_break_value)]
 #![recursion_limit = "512"] // For rustdoc
+#![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
 
 #[macro_use]
 extern crate rustc_macros;