Reverts llvm/llvm-project#183646 Breaks tests if ubsan_minimal runtime isn't built, see: https://github.com/llvm/llvm-project/pull/183646#issuecomment-3994252478
The tests in this directory use a common convention for exercising the functionality associated with bit sets of different sizes. When certain macros are defined the tests instantiate classes that force the bit sets to be of certain sizes. - B32 forces 32-bit bit sets. - B64 forces 64-bit bit sets. - BM forces memory bit sets.