Add support for tagged recorded output

[nilslice]

A successful, but too fragile approach can be seen in #36. I closed the PR but can use it as a basis to start a conversation about a better option.

Ideally, we can use inkwell to do this properly, but I wasn't able to find a solution in a reasonable amount of time.

The crux of this issue is when adding a new match case for a pointer value in get_qis_function_arguments, to operate on the last argument in a function like:

@tag = internal constant [10 x i8] c"tag_value\00"
; ... 

tail call void @__quantum__rt__result_record_output(%Result* null, i8* getelementptr inbounds ([10 x i8], [10 x i8]* @tag, i32 0, i32 0))

I'd like to convert the pointer value into an ArrayType so I can use its len method to get the size of the array we want to take from the constant string (which in this case, happens to be the whole string -- but that might not always be the case).

Further, I'm not sure how to access the indices into the array, nor the variable holding the constant.