Auto merge of #123126 - oli-obk:feed_crate_num, r=davidtwco

Enable `CrateNum` query feeding via `TyCtxt`

Instead of having a magic function that violates some `TyCtxtFeed` invariants, add a `create_def` equivalent for `CrateNum`s.

Note that this still isn't tracked by the query system (unlike `create_def`), and that feeding most `CrateNum` queries for crates other than the local one will likely cause performance regressions.

These things should be attempted on their own separately, but this PR should stand on its own

1 files changed, 5 insertions, 2 deletions

diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs
index cb6656bae06..83377b66095 100644
--- a/compiler/rustc_session/src/cstore.rs
+++ b/compiler/rustc_session/src/cstore.rs
@@ -6,7 +6,9 @@ use crate::search_paths::PathKind;
 use crate::utils::NativeLibKind;
 use rustc_ast as ast;
 use rustc_data_structures::sync::{self, AppendOnlyIndexVec, FreezeLock};
-use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, StableCrateId, LOCAL_CRATE};
+use rustc_hir::def_id::{
+    CrateNum, DefId, LocalDefId, StableCrateId, StableCrateIdMap, LOCAL_CRATE,
+};
 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash, Definitions};
 use rustc_span::symbol::Symbol;
 use rustc_span::Span;
@@ -217,7 +219,6 @@ pub trait CrateStore: std::fmt::Debug {
     // incr. comp. uses to identify a CrateNum.
     fn crate_name(&self, cnum: CrateNum) -> Symbol;
     fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId;
-    fn stable_crate_id_to_crate_num(&self, stable_crate_id: StableCrateId) -> CrateNum;
 }
 
 pub type CrateStoreDyn = dyn CrateStore + sync::DynSync + sync::DynSend;
@@ -227,4 +228,6 @@ pub struct Untracked {
     /// Reference span for definitions.
     pub source_span: AppendOnlyIndexVec<LocalDefId, Span>,
     pub definitions: FreezeLock<Definitions>,
+    /// The interned [StableCrateId]s.
+    pub stable_crate_ids: FreezeLock<StableCrateIdMap>,
 }