Only initialize the superclass fields initially. The constructor was
using an overload of the same class's constructor instead. In most cases
this still behaved as expected because the {frame_} field would be
overwritten with the right value inside the constructor. But when the
stack segment is empty we would keep the wrong value from the
ThreadLocalTop info instead of {nullptr}.

R=jkummerow@chromium.org

Bug: v8:12191, v8:12485
Change-Id: Iff6a7ea7c8501deaee9ac9f95cd066d965ddbe09
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3326241Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78319}