This prepares moving the build directory on bots to out/build. For a
smooth transition, the performance runner will dynamically check
for the build in several locations.

This prepares:
https://crrev.com/c/2426643

NOTREECHECKS=true

Bug: chromium:1132088
Change-Id: Ia12fcdedec0f4ac2bfe087e8154c0acb8771a43f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2431364
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70158}