Reland "Reland "[partition_alloc] Add alternate bucket distribution for PartitionAlloc""

This is a reland of 3fdc7489

This fixes a test that failed on some 32-bit platforms. The code itself
is unchanged from the previous version aside from this test.

Original change's description:
> Reland "[partition_alloc] Add alternate bucket distribution for PartitionAlloc"
>
> This is a reland of bb317f4d
>
> Original change's description:
> > [partition_alloc] Add alternate bucket distribution for PartitionAlloc
> >
> > This should not change any behaviour, but merely allow us to run a Finch
> > experiment comparing the two distribution.
> >
> > Bug: None
> > Change-Id: Ifaac5a1cbcf5d21ce44fa626f57b91a3ed4d7a69
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3272015


> > Reviewed-by: Benoit Lize <lizeb@chromium.org>
> > Reviewed-by: Kentaro Hara <haraken@chromium.org>
> > Commit-Queue: Thiabaud Engelbrecht <thiabaud@google.com>
> > Cr-Commit-Position: refs/heads/main@{#965816}
>
> Bug: None
> Change-Id: I111e1a0dca8049e9c8d412fd0f5ca5eb8fa9104c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3442629


> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Benoit Lize <lizeb@chromium.org>
> Commit-Queue: Thiabaud Engelbrecht <thiabaud@google.com>
> Cr-Commit-Position: refs/heads/main@{#968373}

Bug: None
Change-Id: Iad2bdafd2e352add0ba5272b09d632144f5eba59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3459515


Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Benoit Lize <lizeb@chromium.org>
Commit-Queue: Thiabaud Engelbrecht <thiabaud@google.com>
Cr-Commit-Position: refs/heads/main@{#971984}