This is a reland of a0486202.
It turns out that this gives ~2x speedup on highly parallel WebAssembly
compilation, so let's try again landing this in isolation.

Original change's description:
> [zone] Use 32kb instead of 1MB as high zone page size
>
> It seems that allocating smaller pages is actually quite a bit faster than
> larger pages, probably because they can be cached by malloc. Let's see what the
> bots say.
>
> In a follow-up I'll check whether the segment-pool is actually beneficial or
> whether we should just remove it.
>
> This also drops SegmentSize::kLarge as a way to make compilation deterministic.
> Turns out that by now we need >8mb anyway, and the previous 1mb wasn't enough.
> At the same time the compiler was fixed to not rely on virtual addresses of
> zone objects anymore, and there's a bot checking whether the snapshot is
> determistic.
>
> Change-Id: I38cbb0d209d68b3671fd38763b42714811f4223e
> Reviewed-on: https://chromium-review.googlesource.com/c/1346370
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57683}

Change-Id: I243ba741f0968879b4cfe9f366d81ddc53a9bf27
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1645326Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62007}