Fix *aload formatting operand order.

[stephank]

In packet 52, for example:

{
    "operation": "loop",
    "condition": "var2 < f",
    "instructions": [
        {
            "operation": "write",
            "field": "var2[c]",
            "type": "short"
        }, 
        {
            "operation": "increment",
            "field": "var2",
            "amount": "1"
        }
    ]
}

Clearly, var2 is the loop's iterator, but formatting of certain *aload instructions was flipping operands and making it look like it was indexing the wrong thing.