Squash a couple of remaining places where compilation finalization was
allocating new-space objects.

Bug: chromium:1011762
Change-Id: Ie0462eed422016f860146724a06dd2f1963bd88e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2110019
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66807}