Inline and remove Session::compile_status.

Because it's now simple enough that it doesn't provide much benefit.

compiler/rustc_interface/src/queries.rs

@@ -261,7 +261,9 @@ impl Linker {
         let (codegen_results, work_products) =
             codegen_backend.join_codegen(self.ongoing_codegen, sess, &self.output_filenames);
 
-        sess.compile_status()?;
+        if let Some(guar) = sess.dcx().has_errors() {
+            return Err(guar);
+        }
 
         sess.time("serialize_work_products", || {
             rustc_incremental::save_work_product_index(sess, &self.dep_graph, work_products)