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+ Allow threads to make themselves become orphants
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+ Should write this down somewhere but the idea is that when a process
gets killed, it frees all the memory it can, making all threads within
that process orphans. Orphaned threads are assigned to the init
process, which will generally call exit() on each one. Zombie threads
are threads that own some bit of shared data, and whose reference
count is above zero. They may not be swapped to or called, even though
they take up space in thread map and reserve their thread ID.
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+ Gives a very slight improvement to RPC speeds, but mostly cleans up
code a little bit.
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+ Fairly considerable speedup, as we don't have to look up the rpc pte
every time separately, instead cacheing them. Adds an architecture
specific limitation to total rpc stack size, though.
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