Instead of logging when SFI inlineability is computed, log when
that result is actually used.

Moreover, log something in some cases where we logged nothing
so far (e.g. when we can't inline due to missing feedback vector).

Change-Id: Id93119f4ead17aa9e721eb4fcc20774c54178665
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1873693Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64466}