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PartitionAlloc may use more virtual address space than other allocators,
since the normal bucket superpages are never released to the operating
system, by design.

This is likely causing some issues on Windows 32 bit, where the virtual
address space is typically only 2GiB per process.

Bug: 998048
Change-Id: I77f1e142b5092121db7ab30aafb74e8daca72088
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584027Reviewed-by: Chris Palmer <palmer@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838013}