This causes crashes on Windows, as x18 is the "platform register",
holding a pointer to thread-local storage.

R=jkummerow@chromium.org
CC=seth.brenith@microsoft.com

Bug: v8:12959
Change-Id: I20b8bee145d4ab3a40d8d140d98572df8300251c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3695569Reviewed-by: Seth Brenith <seth.brenith@microsoft.com>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81090}