Add attachComment parser option to disable comment attachment (#13229)

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

@@ -7,13 +7,14 @@ const suite = new Benchmark.Suite();
 
 function benchCases(name, implementation, options) {
   for (const length of [256, 512, 1024, 2048]) {
+    const input = ";".repeat(length);
     suite.add(`${name} ${length} empty statement`, () => {
-      implementation.parse(";".repeat(length), options);
+      implementation.parse(input, options);
     });
   }
 }
 
-benchCases("baseline", baseline);
+benchCases("baseline", baseline, { attachComment: true });
 benchCases("current + attachComment: false", current, { attachComment: false });
 
 suite.on("cycle", report).run();

benchmark/babel-parser/many-leading-trailing-comments/attachComment-false.bench.mjs

@@ -0,0 +1,28 @@
+import Benchmark from "benchmark";
+import baseline from "@babel-baseline/parser";
+import current from "../../lib/index.js";
+import { report } from "../util.mjs";
+
+const suite = new Benchmark.Suite();
+
+function createInput(length) {
+  return "\n// c\na".repeat(length);
+}
+
+function benchCases(name, implementation, options) {
+  for (const length of [256, 512, 1024, 2048]) {
+    const input = createInput(length);
+    const { parse } = implementation;
+    suite.add(
+      `${name} ${length} leading comments + ${length - 1} trailing comments`,
+      () => {
+        parse(input, options);
+      }
+    );
+  }
+}
+
+benchCases("baseline", baseline, { attachComment: true });
+benchCases("current + attachComment: false", current, { attachComment: false });
+
+suite.on("cycle", report).run();

benchmark/babel-parser/many-leading-trailing-comments/bench.mjs

@@ -7,7 +7,7 @@ const suite = new Benchmark.Suite();
 function createInput(length) {
   return "\n// c\na".repeat(length);
 }
-current.parse(createInput(256), {});
+
 function benchCases(name, implementation, options) {
   for (const length of [128, 256, 512, 1024]) {
     const input = createInput(length);