Reorder vec bench extend recycle

library/alloc/benches/vec.rs

@@ -221,6 +221,20 @@ fn bench_extend_1000_1000(b: &mut Bencher) {
     do_bench_extend(b, 1000, 1000)
 }
 
+#[bench]
+fn bench_extend_recycle(b: &mut Bencher) {
+    let mut data = vec![0; 1000];
+
+    b.iter(|| {
+        let tmp = std::mem::replace(&mut data, Vec::new());
+        let mut to_extend = black_box(Vec::new());
+        to_extend.extend(tmp.into_iter());
+        data = black_box(to_extend);
+    });
+
+    black_box(data);
+}
+
 fn do_bench_extend_from_slice(b: &mut Bencher, dst_len: usize, src_len: usize) {
     let dst: Vec<_> = FromIterator::from_iter(0..dst_len);
     let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
@@ -236,20 +250,6 @@ fn do_bench_extend_from_slice(b: &mut Bencher, dst_len: usize, src_len: usize) {
     });
 }
 
-#[bench]
-fn bench_extend_recycle(b: &mut Bencher) {
-    let mut data = vec![0; 1000];
-
-    b.iter(|| {
-        let tmp = std::mem::replace(&mut data, Vec::new());
-        let mut to_extend = black_box(Vec::new());
-        to_extend.extend(tmp.into_iter());
-        data = black_box(to_extend);
-    });
-
-    black_box(data);
-}
-
 #[bench]
 fn bench_extend_from_slice_0000_0000(b: &mut Bencher) {
     do_bench_extend_from_slice(b, 0, 0)