[GISel] Remove BitVector from RegBank. Use tablegen CoverageData tables directly. NFC #71105
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RegBanks are allocated as global variables. The use of BitVector causes a static global constructor to be used. The BitVector is initialized from a table of bits that is created by tablegen. We can keep a pointer to that data and use it as the bit vector instead.
This does require a little bit of manual indexing and reimplementation of BitVector::count.