Rollup merge of rust-lang#134556 - the8472:restore-ns-units, r=jieyouxu

[tiny] fix missing ns units in bootstrap's benchmark rendering

Author: matthiaskrgr

src/bootstrap/src/utils/render_tests.rs

@@ -242,7 +242,7 @@ impl<'a> Renderer<'a> {
             for bench in &self.benches {
                 rows.push((
                     &bench.name,
-                    format!("{:.2?}/iter", bench.median),
+                    format!("{:.2?}ns/iter", bench.median),
                     format!("+/- {:.2?}", bench.deviation),
                 ));
             }