* instruction. Handles AddRegFrm instructions.
*
* @param insn - The instruction whose opcode field is to be read.
- * @param inModRM - Indicates that the opcode field is to be read from the
- * ModR/M extension; useful for escape opcodes
* @return - 0 on success; nonzero otherwise.
*/
static int readOpcodeModifier(struct InternalInstruction* insn) {