Make is_private_dep a query.

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -188,6 +188,7 @@ provide! { <'tcx> tcx, def_id, other, cdata,
     crate_hash => { cdata.root.hash }
     crate_host_hash => { cdata.host_hash }
     crate_name => { cdata.root.name }
+    is_private_dep => { cdata.private_dep }
 
     extra_filename => { cdata.root.extra_filename.clone() }
 
@@ -476,10 +477,6 @@ impl CrateStore for CStore {
         self.get_crate_data(cnum).root.name
     }
 
-    fn crate_is_private_dep_untracked(&self, cnum: CrateNum) -> bool {
-        self.get_crate_data(cnum).private_dep
-    }
-
     fn stable_crate_id_untracked(&self, cnum: CrateNum) -> StableCrateId {
         self.get_crate_data(cnum).root.stable_crate_id
     }

compiler/rustc_middle/src/middle/cstore.rs

@@ -199,7 +199,6 @@ pub trait CrateStore: std::fmt::Debug {
 
     // "queries" used in resolve that aren't tracked for incremental compilation
     fn crate_name_untracked(&self, cnum: CrateNum) -> Symbol;
-    fn crate_is_private_dep_untracked(&self, cnum: CrateNum) -> bool;
     fn stable_crate_id_untracked(&self, cnum: CrateNum) -> StableCrateId;
     fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh;
 

compiler/rustc_middle/src/query/mod.rs

@@ -1412,6 +1412,11 @@ rustc_queries! {
         eval_always
         desc { "generating a postorder list of CrateNums" }
     }
+    /// Returns whether or not the crate with CrateNum 'cnum'
+    /// is marked as a private dependency
+    query is_private_dep(c: CrateNum) -> bool {
+        desc { "check whether crate {} is a private dependency", c }
+    }
     query allocator_kind(_: ()) -> Option<AllocatorKind> {
         desc { "allocator kind for the current crate" }
     }

compiler/rustc_middle/src/ty/context.rs

@@ -1233,16 +1233,6 @@ impl<'tcx> TyCtxt<'tcx> {
         }
     }
 
-    /// Returns whether or not the crate with CrateNum 'cnum'
-    /// is marked as a private dependency
-    pub fn is_private_dep(self, cnum: CrateNum) -> bool {
-        if cnum == LOCAL_CRATE {
-            false
-        } else {
-            self.untracked_resolutions.cstore.crate_is_private_dep_untracked(cnum)
-        }
-    }
-
     #[inline]
     pub fn def_path_hash(self, def_id: DefId) -> rustc_hir::definitions::DefPathHash {
         // Accessing the definitions is ok, since all its contents are tracked by the query system.
@@ -2812,5 +2802,9 @@ pub fn provide(providers: &mut ty::query::Providers) {
         // We want to check if the panic handler was defined in this crate
         tcx.lang_items().panic_impl().map_or(false, |did| did.is_local())
     };
+    providers.is_private_dep = |_tcx, cnum| {
+        assert_eq!(cnum, LOCAL_CRATE);
+        false
+    };
     providers.allocator_kind = |tcx, ()| tcx.resolutions(()).cstore.allocator_kind();
 }