If there is still Liftoff code installed on a function, we cannot reuse
it when tiering down, since we don't know if it was compiled with
debugging capabilities. This made the "debug-step-into-wasm" test flake.

R=thibaudm@chromium.org

Bug: v8:10368
Change-Id: I3672940015c85ec10ead2e33e7792410b47589d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2135732Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66993}