This reverts commit 93063ade.

Reason for revert: Clusterfuzz found issue.

Original change's description:
> [heap] Remove size from invalidated slots
> 
> Slots are always valid inside an invalidated area when outside the
> respective object's current size. This allows us to remove the size
> from the InvalidatedSlots data structure.
> 
> This change was enabled by https://crrev.com/c/1771793.
> 
> Bug: v8:9454
> Change-Id: I2b5a7234d47227cb6ad8d67de20e9b5a2028ae83
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1773242
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63510}

TBR=ulan@chromium.org,sigurds@chromium.org,tebbi@chromium.org,dinfuehr@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:9454
Change-Id: I7daf96cf50aaedd4dbdab48fd550182df94e54bf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1783106Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63535}