Add benchmark for insert_many

Author: nipunn1313

lib.rs

@@ -1051,6 +1051,14 @@ mod bench {
         });
     }
 
+    #[bench]
+    fn bench_insert_many(b: &mut Bencher) {
+        b.iter(|| {
+            let mut vec: SmallVec<[u64; 16]> = SmallVec::new();
+            vec.insert_many(0, 0..100);
+        });
+    }
+
     #[bench]
     fn bench_extend(b: &mut Bencher) {
         b.iter(|| {