Testing V8 CQ after https://crrev.com/i/1139317 and https://crrev.com/i/1141184,
which are changing how host_class dimension is computed and set and how xenial
bots are provisioned.

TBR=tandrii@chromium.org, machenbach@chromium.org

No-Tree-Checks: true
Change-Id: Id7fcda589764b7048f19df97b3bea6e2ad7c97be
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1554694
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60663}