Revert "Reduce the amount of untracked state in TyCtxt"

compiler/rustc_hir/src/hir.rs

@@ -1,7 +1,7 @@
 // ignore-tidy-filelength
 use crate::def::{CtorKind, DefKind, Res};
 use crate::def_id::DefId;
-crate use crate::hir_id::{HirId, ItemLocalId};
+crate use crate::hir_id::HirId;
 use crate::{itemlikevisit, LangItem};
 
 use rustc_ast::util::parser::ExprPrecedence;
@@ -10,7 +10,6 @@ use rustc_ast::{Attribute, FloatTy, IntTy, Label, LitKind, StrStyle, TraitObject
 pub use rustc_ast::{BorrowKind, ImplPolarity, IsAuto};
 pub use rustc_ast::{CaptureBy, Movability, Mutability};
 use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
-use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::{par_for_each_in, Send, Sync};
 use rustc_macros::HashStable_Generic;
 use rustc_span::source_map::Spanned;
@@ -659,9 +658,7 @@ pub struct Crate<'hir> {
     /// they are declared in the static array generated by proc_macro_harness.
     pub proc_macros: Vec<HirId>,
 
-    /// Map indicating what traits are in scope for places where this
-    /// is relevant; generated by resolve.
-    pub trait_map: FxHashMap<LocalDefId, FxHashMap<ItemLocalId, Box<[TraitCandidate]>>>,
+    pub trait_map: BTreeMap<HirId, Vec<TraitCandidate>>,
 
     /// Collected attributes from HIR nodes.
     pub attrs: BTreeMap<HirId, &'hir [Attribute]>,