chore: checkpoint before Python removal

vendor/rustls-pemfile/benches/benchmark.rs

@@ -0,0 +1,20 @@
+use std::io::BufReader;
+
+use bencher::{benchmark_group, benchmark_main, Bencher};
+
+fn criterion_benchmark(c: &mut Bencher) {
+    c.iter(|| {
+        let data = include_bytes!("../tests/data/certificate.chain.pem");
+        let mut reader = BufReader::new(&data[..]);
+        assert_eq!(
+            rustls_pemfile::certs(&mut reader)
+                .collect::<Result<Vec<_>, _>>()
+                .unwrap()
+                .len(),
+            3
+        );
+    });
+}
+
+benchmark_group!(benches, criterion_benchmark);
+benchmark_main!(benches);