[RISCV] Add Clang frontend support for Bitmanip extension
This adds the __riscv_bitmanip macro and the 'b' target feature to enable it. Differential Revision: https://reviews.llvm.org/D71553
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This adds the __riscv_bitmanip macro and the 'b' target feature to enable it. Differential Revision: https://reviews.llvm.org/D71553