[VM/exec] should we store opCode pointer as a register?

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[VM/exec] should we store opCode pointer as a register?

https://github.com/arturo-lang/arturo/blob/3c7884061d252b9ba1c070c8a18ed7f6f841f259/src/vm/exec.nim#L261

    let it = input[1]

    # TODO(VM/exec) should we store opCode pointer as a register?
    #  labels: vm, execution, enhancement, performance
    var i = 0
    var op: OpCode
    var oldSyms: ValueDict

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