public static void or(int[] a, int[] b) {
    for (int i = 0; i < b.length; i++) {
      a[i] |= b[i];
    }
  }
Ors bit array {@code b} into bit array {@code a}. {@code a.length} must be greater than or
equal to {@code b.length}.

@param a {@code non-null;} int array to be ored with other argument. This argument is modified.
@param b {@code non-null;} int array to be ored into {@code a}. This argument is not modified.
android/android_framework/dex-maker/src/main/java/com/android/dx/util/Bits.java