Centralizes all register and vector array definitions to a single set of
aliases, so if these are ever changed, then the rest of the testing code
will follow suit without the need to manually change them.
- Use a std::unique_ptr instead of new/delete.
- UnmappedMemoryHook: Correct range when wraparound of the address space occurs
- UnmappedMemoryHook: Handle case when we attempt to map the same page twice
