Smarter array initialization is neede

[bradunov]

Similarly as before, the following code gets VS down on its knees:

fun comp test() {
  var cellGrid : arr[50*12*14] complex16;
  emit cellGrid;
}
let comp main = read[int] >>> test() >>> write

because it creates 50 \times 12 \times 14 temporary complex16 structs with {0,0} values.