[TOPI] check empty array of x86 injective's iters

[wrongtest-intellif]

Just add a missing check, for following simple case:

#[version = "0.0.5"]
def @main(%v: float32 /* ty=float32 */) -> float32 {
  %0 = fn (%X: float32 /* ty=float32 */, Primitive=1) -> float32 {
    add(%X, 1f /* ty=float32 */) /* ty=float32 */
  } /* ty=fn (float32) -> float32 */;
  %0(%v) /* ty=float32 */
}

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[lhutton1]

Is it possible to add a test case to this fix to prevent regression in the future?