Lioncash 59f872a8e0 core: Make the live Cpu instances unique_ptrs instead of shared_ptrs
There's no need for shared ownership here, as the only owning class
instance of those Cpu instances is the System class itself. We can also
make the thread_to_cpu map use regular pointers instead of shared_ptrs,
given that the Cpu instances will always outlive the cases where they're
used with that map.
2018-10-15 14:15:56 -04:00
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