This was intentionally broken to make updating qemu as quick as possible
when it was woefully out of date, particularly because the interface of
qemu's TCG changed quite a bit, so this code would have needed to be
changed anyways.
Now that qemu is up to date for this variant of Unicorn, we can repair
this functionality and also--and I put massive emphasis on this, since
this wasn't done in the original Unicorn repo--*actually document what
the heck we're doing in this case*, so it's not a pain to change in the
future if we actually need to do that. It makes it much, much, simpler
for people not involved with qemu to understand what is going on in this
case.
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