Use () for codegen queries.

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -482,7 +482,7 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
         codegen_worker_receive,
         shared_emitter_main,
         future: coordinator_thread,
-        output_filenames: tcx.output_filenames(LOCAL_CRATE),
+        output_filenames: tcx.output_filenames(()),
     }
 }
 
@@ -1042,7 +1042,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         // If we know that we won’t be doing codegen, create target machines without optimisation.
         config::OptLevel::No
     } else {
-        tcx.backend_optimization_level(LOCAL_CRATE)
+        tcx.backend_optimization_level(())
     };
     let cgcx = CodegenContext::<B> {
         backend: backend.clone(),
@@ -1061,7 +1061,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         cgu_reuse_tracker: sess.cgu_reuse_tracker.clone(),
         coordinator_send,
         diag_emitter: shared_emitter.clone(),
-        output_filenames: tcx.output_filenames(LOCAL_CRATE),
+        output_filenames: tcx.output_filenames(()),
         regular_module_config: regular_config,
         metadata_module_config: metadata_config,
         allocator_module_config: allocator_config,