The total number of CPU features in use is 32, and is thus hitting the
integer-size limit.
This CL splits the CPU features by platform such that we have some
space again for adding more features.

R=neis@chromium.org

Change-Id: I5cdbe10808e10d143c1e92510dd275d8c5542535
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1850371Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64215}