Revert "Rename solana-runtime to sealevel (#6239)" (#6247)

This reverts commit 2e921437cd.

runtime/benches/message_processor.rs

@@ -0,0 +1,14 @@
+#![feature(test)]
+
+extern crate test;
+
+use solana_runtime::message_processor::*;
+use test::Bencher;
+
+#[bench]
+fn bench_has_duplicates(bencher: &mut Bencher) {
+    bencher.iter(|| {
+        let data = test::black_box([1, 2, 3]);
+        assert!(!has_duplicates(&data));
+    })
+}