Update hotplug codegen backend test

Author: bjorn3

src/test/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs

@@ -1,4 +1,5 @@
 #![feature(rustc_private)]
+#![deny(warnings)]
 
 extern crate rustc_codegen_ssa;
 extern crate rustc_errors;
@@ -15,44 +16,28 @@ use rustc_codegen_ssa::back::linker::LinkerInfo;
 use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_codegen_ssa::{CodegenResults, CrateInfo};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_data_structures::sync::MetadataRef;
 use rustc_errors::ErrorReported;
-use rustc_middle::dep_graph::DepGraph;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
-use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader, MetadataLoaderDyn};
-use rustc_middle::ty::query::Providers;
+use rustc_middle::middle::cstore::EncodedMetadata;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::config::OutputFilenames;
 use rustc_session::Session;
-use rustc_target::spec::Target;
 use std::any::Any;
-use std::path::Path;
 
 struct TheBackend;
 
 impl CodegenBackend for TheBackend {
-    fn metadata_loader(&self) -> Box<MetadataLoaderDyn> {
-        Box::new(rustc_codegen_ssa::back::metadata::DefaultMetadataLoader)
-    }
-
-    fn provide(&self, providers: &mut Providers) {}
-    fn provide_extern(&self, providers: &mut Providers) {}
-
     fn codegen_crate<'a, 'tcx>(
         &self,
         tcx: TyCtxt<'tcx>,
         metadata: EncodedMetadata,
         _need_metadata_module: bool,
     ) -> Box<dyn Any> {
-        use rustc_hir::def_id::LOCAL_CRATE;
-
         Box::new(CodegenResults {
-            crate_name: tcx.crate_name(LOCAL_CRATE),
             modules: vec![],
             allocator_module: None,
             metadata_module: None,
             metadata,
-            windows_subsystem: None,
             linker_info: LinkerInfo::new(tcx, "fake_target_cpu".to_string()),
             crate_info: CrateInfo::new(tcx),
         })
@@ -77,7 +62,7 @@ impl CodegenBackend for TheBackend {
     ) -> Result<(), ErrorReported> {
         use rustc_session::{config::CrateType, output::out_filename};
         use std::io::Write;
-        let crate_name = codegen_results.crate_name;
+        let crate_name = codegen_results.crate_info.local_crate_name;
         for &crate_type in sess.opts.crate_types.iter() {
             if crate_type != CrateType::Rlib {
                 sess.fatal(&format!("Crate type is {:?}", crate_type));