This very slightly improves the performance of bytecode array visitors.

Change-Id: I39df381a26106b5576df74c8c204279b224a92af
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2653227
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72387}