[6.4][ML] Convert std::shared_ptrs to std::unique_ptrs where possible (#115) #121
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…stic#115) Many of our current uses of shared pointer date from when not all our target platforms were C++11 compliant and in particular move semantics weren't available. Now that they all are, we can switch these to std::unique_ptr. This has a few advantages: i) it saves us 16 bytes (8 for the extra pointer to the reference count and 8 for the reference count) per instance, ii) it avoids atomic updates of the reference count, iii) it forces one to have the correct copy semantics in such cases. For example, this showed up that we had an implicit shallow copy (not appropriate) on our naive Bayes implementation and fixing this showed up a bug in restore. This also fixes an error in memory accounting for shared pointers, which wasn't including the extra memory for the reference count.
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Backport of #115.