Auto merge of #93312 - pierwill:map-all-local-trait-impls, r=cjgillot

Return an indexmap in `all_local_trait_impls` query

The data structure previously used here required that `DefId` be `Ord`. As part of #90317, we do not want `DefId` to implement `Ord`.

compiler/rustc_resolve/src/lib.rs

@@ -68,7 +68,7 @@ use rustc_span::{Span, DUMMY_SP};
 
 use smallvec::{smallvec, SmallVec};
 use std::cell::{Cell, RefCell};
-use std::collections::{BTreeMap, BTreeSet};
+use std::collections::BTreeSet;
 use std::ops::ControlFlow;
 use std::{cmp, fmt, iter, mem, ptr};
 use tracing::debug;
@@ -1061,7 +1061,7 @@ pub struct Resolver<'a> {
     item_generics_num_lifetimes: FxHashMap<LocalDefId, usize>,
 
     main_def: Option<MainDefinition>,
-    trait_impls: BTreeMap<DefId, Vec<LocalDefId>>,
+    trait_impls: FxIndexMap<DefId, Vec<LocalDefId>>,
     /// A list of proc macro LocalDefIds, written out in the order in which
     /// they are declared in the static array generated by proc_macro_harness.
     proc_macros: Vec<NodeId>,