chore: checkpoint before Python removal

vendor/chacha20/benches/mod.rs

@@ -0,0 +1,26 @@
+#![feature(test)]
+extern crate test;
+
+cipher::stream_cipher_bench!(
+    chacha20::ChaCha8;
+    chacha8_bench1_16b 16;
+    chacha8_bench2_256b 256;
+    chacha8_bench3_1kib 1024;
+    chacha8_bench4_16kib 16384;
+);
+
+cipher::stream_cipher_bench!(
+    chacha20::ChaCha12;
+    chacha12_bench1_16b 16;
+    chacha12_bench2_256b 256;
+    chacha12_bench3_1kib 1024;
+    chacha12_bench4_16kib 16384;
+);
+
+cipher::stream_cipher_bench!(
+    chacha20::ChaCha20;
+    chacha20_bench1_16b 16;
+    chacha20_bench2_256b 256;
+    chacha20_bench3_1kib 1024;
+    chacha20_bench4_16kib 16384;
+);