[Bug 243837] i386 boot panics after r357314

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243837

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: markj
Date: Mon Feb  3 19:29:02 UTC 2020
New revision: 357463
URL: https://svnweb.freebsd.org/changeset/base/357463

Log:
  Disable the smallest UMA bucket size on 32-bit platforms.

  With r357314, sizeof(struct uma_bucket) grew to 16 bytes on 32-bit
  platforms, so BUCKET_SIZE(4) is 0.  This resulted in the creation of a
  bucket zone for buckets with zero capacity.  A more general fix is
  planned, but for now this bandaid allows 32-bit platforms to boot again.

  PR:           243837
  Discussed with:       jeff
  Reported by:  pho, Jenkins via lwhsu
  Tested by:    pho
  Sponsored by: The FreeBSD Foundation

Changes:
  head/sys/vm/uma_core.c

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