Uninitialized array method call should throw expection. Access to uninitialized properties should be compile error/warning.

[vird]

Slightly related to #482

export function main(): i32 {
  let res = 0;
  let arr:i32[];// initialized with garbage
  
  for(let i=0;i<10;i++) {
    arr.push(i);
  }
  
  return res;
}

This code throws exception on third iteration