Left-shifting a variable of signed type containing a negative value is
undefined behavior.

Bug: chromium:1010465,v8:9330
Change-Id: Ide524f87a7d76f906f6034de4c6605df150c66a8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1847151Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64154}