Only add codegen backend to dep info if -Zbinary-dep-depinfo is used

Author: bjorn3

compiler/rustc_interface/src/passes.rs

@@ -646,11 +646,11 @@ fn write_out_deps(
         });
         files.extend(extra_tracked_files);
 
-        if let Some(ref backend) = sess.opts.debugging_opts.codegen_backend {
-            files.push(backend.to_string());
-        }
-
         if sess.binary_dep_depinfo() {
+            if let Some(ref backend) = sess.opts.debugging_opts.codegen_backend {
+                files.push(backend.to_string());
+            }
+
             boxed_resolver.borrow_mut().access(|resolver| {
                 for cnum in resolver.cstore().crates_untracked() {
                     let source = resolver.cstore().crate_source_untracked(cnum);