test: increase spin for eventloop test on s390

It was excluded as it was failing intermittently. Likely
that s390 was just so fast times were rounded down to 0.

Increase the spin time on s390x only.

Signed-off-by: Michael Dawson <midawson@redhat.com>
PR-URL: https://github.com/nodejs/node/pull/56228
Refs: https://github.com/nodejs/node/issues/41286
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>

test/sequential/sequential.status

@@ -48,7 +48,3 @@ test-tls-securepair-client: PASS, FLAKY
 [$arch==arm]
 # https://github.com/nodejs/node/issues/49933
 test-watch-mode-inspect: SKIP
-
-[$arch==s390x]
-# https://github.com/nodejs/node/issues/41286
-test-performance-eventloopdelay: PASS, FLAKY

test/sequential/test-performance-eventloopdelay.js

@@ -3,6 +3,7 @@
 
 const common = require('../common');
 const assert = require('assert');
+const os = require('os');
 const {
   monitorEventLoopDelay
 } = require('perf_hooks');
@@ -51,9 +52,13 @@ const { sleep } = require('internal/util');
 }
 
 {
+  const s390x = os.arch() === 's390x';
   const histogram = monitorEventLoopDelay({ resolution: 1 });
   histogram.enable();
   let m = 5;
+  if (s390x) {
+    m = m * 2;
+  }
   function spinAWhile() {
     sleep(1000);
     if (--m > 0) {