This reverts https://crrev.com/c/3778717, and also switches "Promise"
to a boolean enum.
The underlying clang crash is fixed, see linked issue.

R=thibaudm@chromium.org

Bug: chromium:1344641
Change-Id: I7fac50eb4f1155aca1c101f01892df78cdde46e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3823128Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82348}