message: llvm-cov target: set proper shared object directory
diff: @@ -349,6 +349,8 @@ fn shared_object_dir() -> PathBuf {
  let target = env::var("TARGET").unwrap();
  if shared_object_dir.file_name() != Some(OsStr::new("llvm-cov-target")) {
  assert_eq!(shared_object_dir.file_name(), Some(OsStr::new(&target)));
  + } else {
  + shared_object_dir.set_file_name(&target);
  }
  }
  