This makes auto-detect-build-configs work on bots (i.e.
if --buildbot was passed).

BUG=v8:5533
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux64_msan_rel,v8_linux64_tsan_rel,v8_linux_arm64_dbg,v8_linux_gc_stress_dbg,v8_linux_noi18n_rel_ng,v8_linux_nosnap_rel

Review-Url: https://chromiumcodereview.appspot.com/2431653002
Cr-Commit-Position: refs/heads/master@{#40424}