This was a shim for the non-I+TF codepath, which is now the only
codepath (that still uses this tier-up mechanism anyway). There were a
couple of places we were accidentally using it due to CompileLazy or
deopts, so this also fixes those.

Reland of https://chromium-review.googlesource.com/951490

Change-Id: I1101eeda7b16651610c6f120062771bdc3c8a49f
Reviewed-on: https://chromium-review.googlesource.com/957032Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51849}