The previous version only stored the lower 32-bits.
This meant that any results that would have
affected the upper 32-bits were ignored. This was
only a problem when jumps are fixed high in the
address space. But, definitely a big problem
nonetheless.

Broken version being committed, so will can commit his broken version so we can both finish our hacking without dealing with repo conflicts.

No commit message

No commit message

and do not try to calculate it ourselves. Do some
other code cleanup as well.