Fix encoding of instructions with add_opcode and REX registers #6
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This fixes encoding of 'POP R8', 'PUSH R15', etc.
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This fixes encoding of 'POP R8', 'PUSH R15', etc.
Previously, no "rex byte" was generated when using REX registers with instructions that use
opcode_addand the register code (>= 0x8) overflowed into the primary opcode, thus changing the instruction in itself.