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.

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