Lazy sweeping may have found a memory block not positioned at the head
of the corresponding bucket. Such a block is not found during a
subsequent free list allocation, as such allocations do not linearly
walk the free list.

Bug: chromium:1056170
Change-Id: I288b6ad768987705d86fc78d0aa6fe46e99417b9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2692822
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72770}