Add rv32b instructions #12
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Everything but `clz` `ctz` and `cpop` should work.
CLZ, CTZ, CPOP, ORC.B, and REV8.
Having the csr_spec option enables CSR testing, including the misa CSR which uses the define `RISCV_FORMAL_CSR_MISA`. If the CSR_MISA flag is defined then instructions from extensions will check the misa CSR includes the bit flag for the instruction. We don't want that, since NERV misa is all zeros.
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