- goma cache silo is a builder to build the same target with cache silo.
  This is needed for fair build performance comparison between reclient
  and Goma.
- reclient compare is a builder to verify artifacts generated in remote
  and that generated locally matches.

Bug: chromium:1233780
Change-Id: I5854d20880e972a07fa09cfc5d4a6f9385844fbb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3058059Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75979}