Remove the (inaccurate) symbol_export_level query.

src/librustc/dep_graph/dep_node.rs

@@ -648,8 +648,6 @@ define_dep_nodes!( <'tcx>
 
     [] InstanceDefSizeEstimate { instance_def: InstanceDef<'tcx> },
 
-    [] GetSymbolExportLevel(DefId),
-
     [] WasmCustomSections(CrateNum),
 
     [input] Features,

src/librustc/ty/maps/mod.rs

@@ -390,7 +390,6 @@ define_maps! { <'tcx>
     [] fn collect_and_partition_translation_items:
         collect_and_partition_translation_items_node(CrateNum)
         -> (Arc<DefIdSet>, Arc<Vec<Arc<CodegenUnit<'tcx>>>>),
-    [] fn symbol_export_level: GetSymbolExportLevel(DefId) -> SymbolExportLevel,
     [] fn is_translated_item: IsTranslatedItem(DefId) -> bool,
     [] fn codegen_unit: CodegenUnit(InternedString) -> Arc<CodegenUnit<'tcx>>,
     [] fn compile_codegen_unit: CompileCodegenUnit(InternedString) -> Stats,

src/librustc/ty/maps/plumbing.rs

@@ -1087,7 +1087,6 @@ pub fn force_from_dep_node<'a, 'gcx, 'lcx>(tcx: TyCtxt<'a, 'gcx, 'lcx>,
 
         DepKind::TargetFeaturesWhitelist => { force!(target_features_whitelist, LOCAL_CRATE); }
 
-        DepKind::GetSymbolExportLevel => { force!(symbol_export_level, def_id!()); }
         DepKind::Features => { force!(features_query, LOCAL_CRATE); }
 
         DepKind::ProgramClausesFor => { force!(program_clauses_for, def_id!()); }

src/librustc_mir/monomorphize/partitioning.rs

@@ -328,7 +328,8 @@ fn place_root_translation_items<'a, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         let mut can_be_internalized = true;
         let default_visibility = |id: DefId| {
             if tcx.sess.target.target.options.default_hidden_visibility &&
-                tcx.symbol_export_level(id) != SymbolExportLevel::C
+               tcx.reachable_non_generics(id.krate).get(&id).cloned() !=
+                    Some(SymbolExportLevel::C)
             {
                 Visibility::Hidden
             } else {

src/librustc_trans/back/symbol_export.rs

@@ -146,7 +146,7 @@ fn reachable_non_generics_provider<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
                     SymbolExportLevel::Rust
                 }
             } else {
-                tcx.symbol_export_level(def_id)
+                symbol_export_level(tcx, def_id)
             };
             debug!("EXPORTED SYMBOL (local): {} ({:?})",
                    tcx.symbol_name(Instance::mono(tcx, def_id)),
@@ -314,17 +314,15 @@ pub fn provide(providers: &mut Providers) {
     providers.reachable_non_generics = reachable_non_generics_provider;
     providers.is_reachable_non_generic = is_reachable_non_generic_provider_local;
     providers.exported_symbols = exported_symbols_provider_local;
-    providers.symbol_export_level = symbol_export_level_provider;
     providers.upstream_monomorphizations = upstream_monomorphizations_provider;
 }
 
 pub fn provide_extern(providers: &mut Providers) {
     providers.is_reachable_non_generic = is_reachable_non_generic_provider_extern;
-    providers.symbol_export_level = symbol_export_level_provider;
     providers.upstream_monomorphizations_for = upstream_monomorphizations_for_provider;
 }
 
-fn symbol_export_level_provider(tcx: TyCtxt, sym_def_id: DefId) -> SymbolExportLevel {
+fn symbol_export_level(tcx: TyCtxt, sym_def_id: DefId) -> SymbolExportLevel {
     // We export anything that's not mangled at the "C" layer as it probably has
     // to do with ABI concerns. We do not, however, apply such treatment to
     // special symbols in the standard library for various plumbing between