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All partitions on 32-bit systems are marked non-scannable, effectively
disabling PCScan and preventing address space waste for quarantine
bitmaps that would never materialize.

Bug: 1159694
Change-Id: I6fea110633ea0a72146beb917810b8b04d603f23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601894Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840457}