IndexOutOfBoundsException may be thrown for fromArray/intoArray/gather/scatter API with unset mask lanes.

To align with API doc, IndexOutOfBoundsException should only be thrown for any illegal vector lane index where the mask at lane is set.

E.g. The following Gather API implementation should not throw IndexOutOfBoundsException when vector lane index is larger than a.length where the mask at lane is unset.

    public static LongVector fromArray(LongSpecies species, long[] a, int i, Mask<Long> m, int[] indexMap, int j)
    {
        // @@@ This can result in out of bounds errors for unset mask lanes
        return zero(species).blend(fromArray(species, a, i, indexMap, j), m);
    }