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With everything classified as Zb[abcs] and pre-0.93 draft-B instructions that are not part of Zb[abcs] removed, we can remove the remaining support code for RVB. Note that RVB has been retired for good and misa.B will neither mean 'some' or 'all of' Zb*: https://lists.riscv.org/g/tech-bitmanip/message/532 Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Message-id: 20210911140016.834071-16-philipp.tomsich@vrull.eu Signed-off-by: Alistair Francis <alistair.francis@wdc.com>