Add a query for checking whether a function is an intrinsic.

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -1752,6 +1752,10 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
     fn get_may_have_doc_links(self, index: DefIndex) -> bool {
         self.root.tables.may_have_doc_links.get(self, index).is_some()
     }
+
+    fn get_is_intrinsic(self, index: DefIndex) -> bool {
+        self.root.tables.is_intrinsic.get(self, index).is_some()
+    }
 }
 
 impl CrateMetadata {

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

@@ -224,6 +224,7 @@ provide! { <'tcx> tcx, def_id, other, cdata,
         tcx.arena.alloc_slice(&result)
     }
     defined_lib_features => { cdata.get_lib_features(tcx) }
+    is_intrinsic => { cdata.get_is_intrinsic(def_id.index) }
     defined_lang_items => { cdata.get_lang_items(tcx) }
     diagnostic_items => { cdata.get_diagnostic_items() }
     missing_lang_items => { cdata.get_missing_lang_items(tcx) }

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1313,6 +1313,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         }
         if impl_item.kind == ty::AssocKind::Fn {
             record!(self.tables.fn_sig[def_id] <- tcx.fn_sig(def_id));
+            if tcx.is_intrinsic(def_id) {
+                self.tables.is_intrinsic.set(def_id.index, ());
+            }
         }
     }
 
@@ -1557,6 +1560,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         }
         if let hir::ItemKind::Fn(..) = item.kind {
             record!(self.tables.fn_sig[def_id] <- tcx.fn_sig(def_id));
+            if tcx.is_intrinsic(def_id) {
+                self.tables.is_intrinsic.set(def_id.index, ());
+            }
         }
         if let hir::ItemKind::Impl { .. } = item.kind {
             if let Some(trait_ref) = self.tcx.impl_trait_ref(def_id) {
@@ -1953,6 +1959,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         self.encode_item_type(def_id);
         if let hir::ForeignItemKind::Fn(..) = nitem.kind {
             record!(self.tables.fn_sig[def_id] <- tcx.fn_sig(def_id));
+            if tcx.is_intrinsic(def_id) {
+                self.tables.is_intrinsic.set(def_id.index, ());
+            }
         }
     }
 }

compiler/rustc_metadata/src/rmeta/mod.rs

@@ -340,6 +340,7 @@ define_tables! {
     impl_parent: Table<DefIndex, RawDefId>,
     impl_polarity: Table<DefIndex, ty::ImplPolarity>,
     impl_constness: Table<DefIndex, hir::Constness>,
+    is_intrinsic: Table<DefIndex, ()>,
     impl_defaultness: Table<DefIndex, hir::Defaultness>,
     // FIXME(eddyb) perhaps compute this on the fly if cheap enough?
     coerce_unsized_info: Table<DefIndex, Lazy!(ty::adjustment::CoerceUnsizedInfo)>,