benchmark: calibrate length of util.diff

500 + 1000 already cover the curve. 2000 doesn’t add new qualitative insight — it just extends the same curve further down (another ~3–4× slowdown). According to nodejs/performance#186 this benchmark takes one minute to conclude a single run. This should fix it. PR-URL: nodejs#59588 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Author: RafaelGSS

benchmark/util/diff.js

@@ -5,7 +5,7 @@ const common = require('../common');
 
 const bench = common.createBenchmark(main, {
  n: [1e3],
- length: [1e3, 2e3],
+ length: [500, 1000],
  scenario: ['identical', 'small-diff', 'medium-diff', 'large-diff'],
 });