Win64 MSVC build seems to be fixed.

Bug: v8:178
Change-Id: I6d3ec22511a7a3c25467c486d3d05df0939c7c87
Reviewed-on: https://chromium-review.googlesource.com/970469
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52068}