... in regexp bytecode {length,name} accessors and in peephole
optimization.

Bug: chromium:1095866
Change-Id: I78c89d35d796776b61eabf82b921f7582e431be7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2250243Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68400}