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Group members that are accessed on the fast path at the beginning of the
object. While the buckets are large enough that the relevant one is
likely several cache lines away from the beginning of the object,
reducing the distance may still help, and we've seen evidence that
PartitionAlloc is sensitive to layout.

Bug: 998048
Change-Id: I8642aa83b48a5e0890b2eb39e14a25fb7d6a3b90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568288
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833280}