benchmark: skip test-benchmark-os on IBMi

- IBMi does not have the os.uptime implemented so skip
  otherwise CI tests fail.

Signed-off-by: Michael Dawson <midawson@redhat.com>
PR-URL: https://github.com/nodejs/node/pull/50286
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

benchmark/os/uptime.js

@@ -1,14 +1,21 @@
 'use strict';
 
+const os = require('os');
 const common = require('../common.js');
-const uptime = require('os').uptime;
 const assert = require('assert');
 
+const uptime = os.uptime;
+
 const bench = common.createBenchmark(main, {
   n: [1e5],
 });
 
 function main({ n }) {
+  if (os.type() === 'OS400') {
+    console.log('Skipping: os.uptime is not implemented on IBMi');
+    process.exit(0);
+  }
+
   // Warm up.
   const length = 1024;
   const array = [];

test/benchmark/benchmark.status

@@ -20,6 +20,3 @@ prefix benchmark
 
 [$arch==arm]
 
-[$system==ibmi]
-test-benchmark-os.js: SKIP
-