benchmarks: reduce allocations in run_util_function

Author: xtqqczze

src/uucore/src/lib/features/benchmark.rs

@@ -31,9 +31,10 @@ pub fn run_util_function<F>(util_func: F, args: &[&str]) -> i32
 where
     F: FnOnce(std::vec::IntoIter<std::ffi::OsString>) -> i32,
 {
+    let mut os_args = Vec::with_capacity(args.len() + 1);
     // Prepend a dummy program name as argv[0] since clap expects it
-    let mut os_args: Vec<std::ffi::OsString> = vec!["benchmark".into()];
-    os_args.extend(args.iter().map(|s| (*s).into()));
+    os_args.push("benchmark".into());
+    os_args.extend(args.iter().map(Into::into));
     util_func(os_args.into_iter())
 }