Reason for revert:
Revert it.
Original issue's description:
> [heap] Fine-grained JSArrayBuffer tracking
>
> Track based on JSArrayBuffer addresses instead of the attached backing store.
> This way we can later on iterate buffers on a single page. The reland also
> switches to a page-based implementation where a page contains the set of its
> contained (live and dead) buffers.
>
> Details of tracking:
> - Scavenge: New space pages are processes in bulk on the main thread
> - MC: Unswept pages are processed in bulk in parallel. All other pages
> are processed by the sweeper concurrently.
>
> BUG=chromium:611688
> LOG=N
> CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
>
> Committed: https://crrev.com/b2d8bfc7931eef49d527605ba485950dea41cde3
> Cr-Commit-Position: refs/heads/master@{#36437}
TBR=hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:611688
Review-Url: https://codereview.chromium.org/2006183003
Cr-Commit-Position: refs/heads/master@{#36461}
d2dff0320b