This is to speed up slow nosnap runs. Allocation verification is covered by
running mksnapshot on other builders.

Change-Id: I9c286f7dd4abac9cf1be45be4a483a7b36d09f8a
Reviewed-on: https://chromium-review.googlesource.com/1059113Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53234}