benchmark: add benchmark for vm.createContext

PR-URL: #29845
Refs: #29842
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

Author: joyeecheung

benchmark/vm/create-context.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  n: [100]
+});
+
+const vm = require('vm');
+
+const ctxFn = new vm.Script(`
+  var b = Math.random();
+  var c = a + b;
+`);
+
+function main({ n }) {
+  bench.start();
+  let context;
+  for (let i = 0; i < n; i++) {
+    context = vm.createContext({ a: 'a' });
+  }
+  bench.end(n);
+  ctxFn.runInContext(context);
+}