message: test ui output also in rustc test suite
diff: @@ -38,7 +38,7 @@ fn run_tests(mode: Mode, path: &str, target: Option<String>) {
  flags.push(target.clone());
  }
  - let skip_ui_checks = in_rustc_test_suite || env::var_os("MIRI_SKIP_UI_CHECKS").is_some();
  + let skip_ui_checks = env::var_os("MIRI_SKIP_UI_CHECKS").is_some();
  let output_conflict_handling = match (env::var_os("MIRI_BLESS").is_some(), skip_ui_checks) {
  (false, false) => OutputConflictHandling::Error,
  