[MC][TableGen] Make MCRegisterClasses relocation-free (#206753) MCRegisterClasses currently store pointers to the register list and the bit set. Store these three types together in one data structure and use relative offsets to avoid these relocations and move the large MCRegisterClasses array from .data.rel.ro into .data. This reduces the amount of data that needs to be relocated by 86 KB. This has two side effects: first, MCRegisterClass is not copyable and the few uses that did copy were changed. Second, the MCRegisterClasses array is no longer easily accessible as a global (well, it *technically* is, but that requires the type of the entire storage struct, which I don't want to expose). Therefore, these accesses need to go through a function; which shouldn't be too costly and be inlined in an LTO build.
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