When compaction is aborted during marking, the
start_of_evacuation_area_ value would previously be set to -1. This
would, however, cause some DCHECK failures during sweeping, which
expect this value to contain the (previous) start value. This is now
fixed by just setting the top bits of the start_of_evacuation_area_
value when aborting compaction. During sweeping, these bits are
cleared again and the DCHECKs work as expected.

Bug: v8:10391, chromium:1355640
Change-Id: Id48ee71a3942b3e0b88e8e1667a8f9e109a68bb3
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/+/3849650
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82661}