Supercedes: 20210228232321.322053-1-richard.henderson@linaro.org
("i386 cleanup part 3")
Claudio's prerequite patch set ("i386 cleanup part 2"), is now merged.
Version 2 here fixes some minor rebase conflicts that crept in.
Only 4 of the 50 patches have been reviewed.
Blurb from v1:
This started out to address a fixme in Claudio's patch set, then
wandered a bit, with cleanups and bug fixes in the code that I was
touching. I stopped when I reached my original goal of removing
target/i386/tcg/user/*_stubs.c.
There are a lot of patches, but hopefully they're all small
enough to be obvious.