MSVC wants the static cast, even if the constant fits in the narrower
type anyway.

R=ahaas@chromium.org

Change-Id: I40043c02db1524ac591f6dcea14333695a53d028
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1924356Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65482}