make intrinsic query legal for any DefId

Author: oli-obk

Diff for: compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1051,17 +1051,15 @@ fn should_encode_mir(
         // Coroutines require optimized MIR to compute layout.
         DefKind::Closure if tcx.is_coroutine(def_id.to_def_id()) => (false, true),
         // Full-fledged functions + closures
-        def_kind @ (DefKind::AssocFn | DefKind::Fn | DefKind::Closure) => {
+        DefKind::AssocFn | DefKind::Fn | DefKind::Closure => {
             let generics = tcx.generics_of(def_id);
             let mut opt = tcx.sess.opts.unstable_opts.always_encode_mir
                 || (tcx.sess.opts.output_types.should_codegen()
                     && reachable_set.contains(&def_id)
                     && (generics.requires_monomorphization(tcx)
                         || tcx.cross_crate_inlinable(def_id)));
-            if matches!(def_kind, DefKind::AssocFn | DefKind::Fn) {
-                if let Some(intrinsic) = tcx.intrinsic(def_id) {
-                    opt &= !intrinsic.must_be_overridden;
-                }
+            if let Some(intrinsic) = tcx.intrinsic(def_id) {
+                opt &= !intrinsic.must_be_overridden;
             }
             // The function has a `const` modifier or is in a `#[const_trait]`.
             let is_const_fn = tcx.is_const_fn_raw(def_id.to_def_id())
@@ -1414,9 +1412,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             if let DefKind::Fn | DefKind::AssocFn = def_kind {
                 self.tables.asyncness.set_some(def_id.index, tcx.asyncness(def_id));
                 record_array!(self.tables.fn_arg_names[def_id] <- tcx.fn_arg_names(def_id));
-                if let Some(name) = tcx.intrinsic(def_id) {
-                    record!(self.tables.intrinsic[def_id] <- name);
-                }
+            }
+            if let Some(name) = tcx.intrinsic(def_id) {
+                record!(self.tables.intrinsic[def_id] <- name);
             }
             if let DefKind::TyParam = def_kind {
                 let default = self.tcx.object_lifetime_default(def_id);

Diff for: compiler/rustc_middle/src/ty/util.rs

@@ -1643,6 +1643,10 @@ pub fn is_doc_notable_trait(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
 
 /// Determines whether an item is an intrinsic (which may be via Abi or via the `rustc_intrinsic` attribute)
 pub fn intrinsic(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<ty::IntrinsicDef> {
+    match tcx.def_kind(def_id) {
+        DefKind::Fn | DefKind::AssocFn => {}
+        _ => return None,
+    }
     if matches!(tcx.fn_sig(def_id).skip_binder().abi(), Abi::RustIntrinsic)
         || tcx.has_attr(def_id, sym::rustc_intrinsic)
     {

Diff for: compiler/rustc_ty_utils/src/instance.rs

@@ -1,5 +1,4 @@
 use rustc_errors::ErrorGuaranteed;
-use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::query::Providers;
@@ -28,8 +27,7 @@ fn resolve_instance<'tcx>(
             tcx.normalize_erasing_regions(param_env, args),
         )
     } else {
-        let def = if matches!(tcx.def_kind(def_id), DefKind::Fn) && tcx.intrinsic(def_id).is_some()
-        {
+        let def = if tcx.intrinsic(def_id).is_some() {
             debug!(" => intrinsic");
             ty::InstanceDef::Intrinsic(def_id)
         } else if Some(def_id) == tcx.lang_items().drop_in_place_fn() {