chore: reorganize benchmarks (#13606)

benchmark/babel-parser/many-empty-statements/attachComment-false.bench.mjs

@@ -0,0 +1,19 @@
+import Benchmark from "benchmark";
+import baseline from "@babel-baseline/parser";
+import current from "@babel/parser";
+import { report } from "../../util.mjs";
+
+const suite = new Benchmark.Suite();
+
+function benchCases(name, implementation, options) {
+  for (const length of [256, 512, 1024, 2048]) {
+    suite.add(`${name} ${length} empty statement`, () => {
+      implementation.parse(";".repeat(length), options);
+    });
+  }
+}
+
+benchCases("baseline", baseline);
+benchCases("current + attachComment: false", current, { attachComment: false });
+
+suite.on("cycle", report).run();