benchmark: add benchmark for v8.getHeap*Statistics

PR-URL: https://github.com/nodejs/node/pull/12681
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

benchmark/v8/get-stats.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const common = require('../common.js');
+const v8 = require('v8');
+
+const bench = common.createBenchmark(main, {
+  method: [
+    'getHeapStatistics',
+    'getHeapSpaceStatistics'
+  ],
+  n: [1e6],
+  flags: ['--ignition --turbo', '']
+});
+
+function main(conf) {
+  const n = +conf.n;
+  const method = conf.method;
+  var i = 0;
+  bench.start();
+  for (; i < n; i++)
+    v8[method]();
+  bench.end(n);
+}