removed nonfunctioning benchmark

It could also have been fixed by removing a semicolon instead.

library/std/src/num.rs

@@ -9,9 +9,6 @@
 #[cfg(test)]
 mod tests;
 
-#[cfg(test)]
-mod benches;
-
 #[stable(feature = "saturating_int_impl", since = "1.74.0")]
 pub use core::num::Saturating;
 #[stable(feature = "rust1", since = "1.0.0")]

library/std/src/num/benches.rs

@@ -1,9 +0,0 @@
-use test::Bencher;
-
-#[bench]
-fn bench_pow_function(b: &mut Bencher) {
-    let v = (0..1024).collect::<Vec<u32>>();
-    b.iter(|| {
-        v.iter().fold(0u32, |old, new| old.pow(*new as u32));
-    });
-}