This reverts commit eca383c9.

Reason for revert: Still seeing DCHECK failures in SweepAndCompact

Original change's description:
> Reland "[sandbox] Sandboxify EmbedderDataSlots"
>
> This is a reland of commit e1f585ed
>
> ExternalPointerTable issues have been fixed in
> https://crrev.com/c/3849650 and https://crrev.com/c/3849376
>
> Original change's description:
> > [sandbox] Sandboxify EmbedderDataSlots
> >
> > Bug: v8:10391
> > Change-Id: If85a308a6f6ed1b17d86f87b4911c82d2327ea72
> > Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3757341
> > Reviewed-by: Igor Sheludko <ishell@chromium.org>
> > Commit-Queue: Samuel Groß <saelo@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#82623}
>
> Bug: v8:10391
> Change-Id: If77f6c10e81c30c2dfa6b33c788bc4a36e4da135
> Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3852602
> Commit-Queue: Samuel Groß <saelo@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82686}

Bug: v8:10391
Change-Id: Icaa1ff64cabd1bb2f19d9b019eac0ca98e528eb6
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3854677Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82698}