redirect `exported_symbols` through `shared`

src/librustc_trans/context.rs

@@ -678,10 +678,6 @@ impl<'b, 'tcx> CrateContext<'b, 'tcx> {
         unsafe { llvm::LLVMRustGetModuleDataLayout(self.llmod()) }
     }
 
-    pub fn exported_symbols<'a>(&'a self) -> &'a NodeSet {
-        &self.shared.exported_symbols
-    }
-
     pub fn needs_unwind_cleanup_cache(&self) -> &RefCell<FxHashMap<Ty<'tcx>, bool>> {
         &self.local().needs_unwind_cleanup_cache
     }

src/librustc_trans/debuginfo/utils.rs

@@ -37,7 +37,7 @@ pub fn is_node_local_to_unit(cx: &CrateContext, node_id: ast::NodeId) -> bool
     // visible). It might better to use the `exported_items` set from
     // `driver::CrateAnalysis` in the future, but (atm) this set is not
     // available in the translation pass.
-    !cx.exported_symbols().contains(&node_id)
+    !cx.shared().exported_symbols().contains(&node_id)
 }
 
 #[allow(non_snake_case)]