Auto merge of #83610 - bjorn3:driver_cleanup, r=cjgillot

rustc_driver cleanup

Best reviewed one commit at a time.

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -218,13 +218,11 @@ impl CodegenBackend for CraneliftCodegenBackend {
     ) -> Result<(), ErrorReported> {
         use rustc_codegen_ssa::back::link::link_binary;
 
-        let target_cpu = crate::target_triple(sess).to_string();
         link_binary::<crate::archive::ArArchiveBuilder<'_>>(
             sess,
             &codegen_results,
             outputs,
             &codegen_results.crate_name.as_str(),
-            &target_cpu,
         );
 
         Ok(())