Revert of Use a bitmap to record PageMemoryRegion usage. (patchset #1 id:1 of https://codereview.chromium.org/1748363005/ )
Reason for revert:
Using a bitmap is problematic as pages within a region may belong to different threads (see https://crbug.com/591217 ).
Revert back to previous and use a separate bool per thread to avoid overlap.
Original issue's description:
> Use a bitmap to record PageMemoryRegion usage.
>
> R=haraken
> BUG=420515
>
> Committed: https://crrev.com/648b0ff04620c688b1d8926b06220f45da3e4598
> Cr-Commit-Position: refs/heads/master@{#378449}
TBR=oilpan-reviews@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=420515
Review URL: https://codereview.chromium.org/1749103005
Cr-Commit-Position: refs/heads/master@{#378756}
2 files changed
