Test strange deserialzation bug on 32bit

[timholy]

Since I don't have easy access to a 32bit machine, this seems to be the best way to find out whether the strange error in #23194 (comment) is a consequence of code changes or simply revealing a latent bug. (This passes locally on 64bit.)

[tkelman]

You don't need a 32 bit machine to test 32 bit Julia, at least on any distribution that has multilib compilers available it's pretty easy to build 32 bit Julia on 64 bit Linux (this is what we do on both Travis and Circle) - set override ARCH = i686 in a Make.user

[timholy]

I found that I got errors when I tried this with an existing directory (even after make cleanall), but starting from a fresh clone seems to be successfully underway (so far).

[tkelman]

yeah you'll at least need to do a new out of tree build at a minimum, changing arch in place isn't something our makefiles can handle well (distcleanall could work but that's basically equivalent to a new clone)

[timholy]

Very useful tip, thanks. Fixed in #23348 and #23194