Those globals must have type float instead of int to preserve the sign
bit.

R=ahaas@chromium.org

Bug: chromium:1069173
Change-Id: I9769f47f087aaba94a6172118be44f70adeded0c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2379861Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69609}