This CL removes the caching of the stack slot used for the fallback mechanism
in V8, as the current implementation is incorrect and needs to be reworked.

Bug: chromium:1185753
Change-Id: I9f77bc42bfd649e0dbcd294b000b48c928cf99d0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2743886
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73300}