Remove some depgraph edges on the HIR by invoking the intrinsic query instead of checking the attribute

Author: oli-obk

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -16,7 +16,6 @@ use rustc_middle::ty::{self, SymbolName, TyCtxt};
 use rustc_middle::ty::{GenericArgKind, GenericArgsRef};
 use rustc_middle::util::Providers;
 use rustc_session::config::{CrateType, OomStrategy};
-use rustc_span::sym;
 use rustc_target::spec::{SanitizerSet, TlsModel};
 
 pub fn threshold(tcx: TyCtxt<'_>) -> SymbolExportLevel {
@@ -82,7 +81,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
                 return library.kind.is_statically_included().then_some(def_id);
             }
 
-            if tcx.has_attr(def_id, sym::rustc_intrinsic_must_be_overridden) {
+            if tcx.intrinsic(def_id).is_some_and(|i| i.must_be_overridden) {
                 return None;
             }
 

compiler/rustc_mir_transform/src/cross_crate_inline.rs

@@ -23,7 +23,7 @@ fn cross_crate_inlinable(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
         return false;
     }
 
-    if tcx.has_attr(def_id, sym::rustc_intrinsic_must_be_overridden) {
+    if tcx.intrinsic(def_id).is_some_and(|i| i.must_be_overridden) {
         return false;
     }
 

compiler/rustc_mir_transform/src/lib.rs

@@ -632,9 +632,9 @@ fn optimized_mir(tcx: TyCtxt<'_>, did: LocalDefId) -> &Body<'_> {
 }
 
 fn inner_optimized_mir(tcx: TyCtxt<'_>, did: LocalDefId) -> Body<'_> {
-    if let Some(attr) = tcx.get_attr(did, sym::rustc_intrinsic_must_be_overridden) {
+    if tcx.intrinsic(did).is_some_and(|i| i.must_be_overridden) {
         span_bug!(
-            attr.span,
+            tcx.def_span(did),
             "this intrinsic must be overridden by the codegen backend, it has no meaningful body",
         )
     }

compiler/rustc_monomorphize/src/collector.rs

@@ -1019,7 +1019,7 @@ fn should_codegen_locally<'tcx>(tcx: TyCtxt<'tcx>, instance: &Instance<'tcx>) ->
         return false;
     }
 
-    if tcx.has_attr(def_id, sym::rustc_intrinsic_must_be_overridden) {
+    if tcx.intrinsic(def_id).is_some_and(|i| i.must_be_overridden) {
         // These are implemented by backends directly and have no meaningful body.
         return false;
     }