The flag hash is used by code caching to recognize incompatible V8
configurations. When the flag hash differs, the cache is thrown out.

Code produced by embed/noembed builds is incompatible, and thus needs
to change the flag hash as well.

Bug: v8:6666, v8:7739
Change-Id: Icae8c6dc39b2eab491d28b2155f67103acf68181
Reviewed-on: https://chromium-review.googlesource.com/1057331Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53152}