Replace by a unary right fold using the comma operator. This also
evaluates from left to right, so has the same semantics but uses
standard C++17 syntax.

R=tebbi@chromium.org

Bug: v8:12425
Change-Id: I680800ba07b048ee85d9da4ae32c12825df14e54
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3576131Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79877}