Add --compile-only and --repeat-compile=N options for benchmarking
compilation performance.

Change-Id: Ibcdce94ef0d2a24374badeca114f44b693adb2ac
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2827903
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73987}