This improves a pattern that appears in the SunSpider
base64 benchmark.

Change-Id: I1b5f4535d24d8a39cc480508d1e11c8e92e0135c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3654098Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80629}