This flag would help customers understand why Liftoff bails out, thus
make it available also in release builds.

R=jkummerow@chromium.org

Change-Id: Ie2f69cbeaee617632f772030a3e03f052f688a10
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1888071Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64622}