[SystemZ] [NFC] Replace SpecialRegisters field with a unique_ptr instead of a raw pointer.
This patch replaces the SpecialRegisters field with a unique_ptr instead of a raw pointer. This is better practice, and allows us to remove the definition of the dtor for the SystemZSubtarget class. Reviewed By: uweigand, Kai Differential Revision: https://reviews.llvm.org/D108639
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