It's sufficient to expose a run function and flags.

Bug: v8:7790
Change-Id: I956a545ddce9e469e6a6196a4b63d9e3a119526d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1706469
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62774}