Get rid of coercion dot when using a smaller integer for index

[nanocyte]

Along the same line of thinking as this idea:

https://forums.ni.com/t5/LabVIEW-FPGA-Idea-Exchange/Handle-Fixed-Point-Integers-Going-Into-Case-Stru...

It would be cool if we got rid of the coercion dot here for smaller integers and integer fixed point numbers as the index for an array.

As it is, it's hard to tell if the compiler will use the bigger I32 for this.

This behavior would also useful for other integer inputs like the memory address input.

[cbutcher]

Does the compiler use an I32 for this?