Add script to compare V8 tests on two CLs

E.g. used to test equality of testing after:
https://crrev.com/c/4538761

Bug: chromium:1132088
Change-Id: Idcea6077b5e48d0b73fa4f9dec2e899f1157a020
Reviewed-on: https://chromium-review.googlesource.com/c/infra/experimental/+/4648372
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
1 file changed