Since CodePages is now a member of the guest to host map, which could
be replaced when JITing ARM code, any additions to it must be moved after that.
Additionally there is no benefit marking code pages for invalidation at all if
they are never added to the cache as in the single-step case.
This does technically prolong the window of an existing race where guest code
modifications could be missed, however this is unlikely to cause issues and didn't
prior.
Billy Laws
fd58f17dbe