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Another sanity check.
We don't really have a clear big picture yet. But I've now slapped on checks
for all the issues I was worrying about.
A more rigorous solution would be some sort of interval tree. We'd also
need to track segments generated at translation time. We don't do that
so far.
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Error messages if we ever get segments messed up.
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Now simulated 'Memory' isn't just a single flat array. Instead it knows
about segments and VMAs.
The code segment will always be first, and the data/heap segment will always
be second. The brk() syscall knows about the data segment.
One nice side-effect is that I no longer need to mess with Memory initialization
regardless of where I place my segments.
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